British Shorthair Health Calgary: HCM, PKD, Blood Type B

HCM is the most common feline heart disease overall, but BSH carry elevated breed risk. The disease causes the wall of the left ventricle to thicken abnormally. The chamber holds less blood, the heart works harder, and in some cats the condition progresses to congestive heart failure, a saddle thrombus that paralyses the rear legs, or sudden cardiac death.

Prevalence: the Granstrom 2011 Danish cohort

The most-cited BSH HCM prevalence study is Granstrom et al. 2011, published in the Journal of Veterinary Internal Medicine and indexed on PubMed as PMID 21736622. The cohort examined 329 BSH by echocardiogram. The headline numbers: 8.5 percent of the cats were HCM-positive on echo, and another 4.3 percent were equivocal. Males were significantly more affected, at 20.4 percent prevalence. The honest summary: roughly 1 in 12 BSH overall, and roughly 1 in 5 male BSH, were affected at the time of study, with risk rising further with age. Field studies (less formally published but cited in feline cardiology references) place BSH HCM prevalence at roughly 2 to 3 times the general cat population. This puts BSH among the breeds with documented elevated cardiac risk, alongside Maine Coon, Ragdoll, and Sphynx.

Why a Maine Coon or Ragdoll DNA test is the wrong answer

The Maine Coon HCM mutation is called A31P, and the Ragdoll HCM mutation is called R820W. Both are validated for their respective breeds and are useful screening tools in those populations. Both have been occasionally detected in individual BSH on commercial breed panels. Neither is breed-typing for BSH. Recommending a Maine Coon A31P test or a Ragdoll R820W test as a BSH HCM screening tool is medically incorrect. A negative result on those tests does NOT mean a BSH will not develop HCM, because the BSH cardiac risk is not driven by the A31P or R820W mutations. A positive result does NOT predict BSH disease because the predictive value of those mutations has only been established in Maine Coon and Ragdoll populations.

The practical conclusion for Calgary owners: do not run a Maine Coon or Ragdoll HCM DNA test on a BSH expecting it to mean something. Spend that money on the baseline echocardiogram at Western Veterinary Specialist & Emergency Centre instead.

The actual screening tool: echocardiogram by a veterinary cardiologist

Echocardiogram is the gold standard for HCM screening in any breed, and it is the only validated screening tool for BSH. The recommended schedule for BSH is a baseline at age 1 to 2, then a repeat every 1 to 2 years until age 7, then annually thereafter. The schedule reflects the Granstrom 2011 prevalence data and the established rise in feline HCM risk with age. In Calgary, this is a referral from your general-practice vet to Western Veterinary Specialist & Emergency Centre, which houses the city's main feline cardiology service. Expect roughly $400 to $600 per scan.

The insurance timing window

Every Canadian pet insurance provider excludes pre-existing conditions. If a BSH is enrolled in pet insurance BEFORE the first baseline echocardiogram at age 1 to 2, cardiac coverage is included. If the same BSH is enrolled AFTER the first echo flagged any change, cardiac coverage is excluded indefinitely. Given that BSH HCM management can become a significant cumulative cost over a 12-to-17 year cat, the timing of the policy purchase is more financially material for this breed than for an average cat. Buy before age 3, before the baseline echo.

Symptoms and emergency signs

HCM is often silent until late. Watch for increased respiratory rate at rest (a sleeping cat should breathe 15 to 30 times per minute; persistently faster is a vet call), lethargy in a usually placid BSH that becomes notably less engaged, sudden weakness or collapse, rear-leg paralysis (saddle thrombus, a same-day emergency), or open-mouth breathing. Open-mouth breathing in any cat is a same-day Calgary 24-hour emergency. Treatment is entirely vet-directed and depends on stage of disease. No medication or dosage is recommended on this page.

Autosomal-dominant Polycystic Kidney Disease (ADPKD) causes cysts to form in the kidneys, gradually replacing functional renal tissue. Most affected cats develop chronic kidney disease by middle age. Because the inheritance is autosomal dominant, a single defective copy from one parent is enough to cause disease; an affected parent passes the mutation to roughly half of any litter.

The Persian connection

BSH carry PKD1 because the breed was reconstructed using heavy Persian outcrosses in the mid-twentieth century, after the breed's numbers collapsed during the Second World War. The Persian ADPKD1 mutation rode along into the BSH gene pool. Historically this made PKD1 a meaningful BSH concern. Today, thanks to widespread DNA testing in reputable breeding programs, prevalence has dropped sharply in screened lines.

The UC Davis VGL data

The UC Davis Veterinary Genetics Laboratory tracks variant frequency in tested populations and publishes summary data on its breed pages. BSH PKD1 variant frequency in tested cats dropped from 0.99 percent in 2019 to 0.71 percent in 2022. That trend reflects the effect of widespread DNA testing combined with responsible breeder decisions not to use affected cats. PKD1 is now one of the genuine success stories of feline genetic testing.

The UC Davis VGL DNA test

UC Davis VGL offers the feline PKD1 DNA test for approximately $44 alone, or $66 bundled with the PRA-pd test. A cheek swab kit is mailed to you, you collect the sample at home, and you return it for laboratory analysis. Results typically come back within 2 to 3 weeks. The test result is definitive: clear, heterozygous (one copy, affected), or homozygous (two copies, more severely affected). For pedigreed BSH kittens, ask the breeder for the PKD1 certificate on both parents before agreeing to a deposit. For an adopted BSH-type rescue cat without paperwork, running the test once answers the genetic question for life.

If your cat tests positive

A positive PKD1 result is not an emergency. Most affected cats progress slowly. The management plan involves monitoring renal function on annual bloodwork (a chemistry panel including BUN, creatinine, and SDMA), watching for clinical signs of kidney disease as the cat ages, and treating chronic kidney disease as it develops. Discuss specifics with your Calgary veterinarian. Pet insurance enrolled before the diagnosis is the financial leverage that matters here.

Cats have three blood types: A (the most common), B (relatively rare overall but common in certain breeds), and AB (very rare). Unlike dogs, cats develop strong naturally occurring antibodies against the opposite blood type from very early in life, without any prior exposure. This is what makes feline blood type mismatch acutely dangerous in both transfusion and the breeding context known as neonatal isoerythrolysis.

BSH prevalence: 20 to 45 percent Type B

Multiple international surveys place BSH Type B frequency at 20 to 45 percent depending on country and breeding lines. This sits among the highest Type B frequencies of any breed. By contrast, a Calgary and Saskatoon study of domestic shorthair cats (indexed on PubMed Central as PMC7186432) found only about 3 to 4 percent Type B in the broader pet population. The gap between BSH and the general Calgary cat population is large enough that BSH-specific clinical handling is warranted.

Neonatal isoerythrolysis (NI): the breeding catastrophe

A Type B queen bred to a Type A tom produces kittens that may be Type A. Those Type A kittens are born healthy, then nurse the mother's colostrum in the first 24 to 48 hours of life. The colostrum contains powerful anti-A antibodies, because the Type B queen's immune system makes them naturally without prior exposure. The antibodies cross into the kitten's bloodstream through the immature neonatal gut, attack the kitten's Type A red blood cells, and kill the kitten within 1 to 3 days. Mortality is high. This is preventable entirely by typing both parents before breeding and either avoiding Type B queen + Type A tom matings or removing the kittens from the mother within the first 24 hours and bottle-raising them. Adopters of pedigreed BSH should ask whether breeding parents were blood-typed.

Transfusion safety

Any BSH that needs a blood transfusion (during surgery, after trauma, or for severe anaemia from disease) must be blood-typed before the transfusion. A mismatched transfusion (Type A blood given to a Type B cat or vice versa) triggers an acute haemolytic transfusion reaction, which can be fatal. The risk is high enough that pre-transfusion typing is standard practice in any responsible feline ICU. For a BSH facing elective surgery, pre-anaesthesia blood typing is reasonable practice because of the elevated likelihood of needing blood support in an unexpected complication.

The UC Davis VGL blood type test

UC Davis VGL offers a feline blood type DNA test for roughly $45 to $60, depending on bundling with other tests. Cheek swab kit, results in 2 to 3 weeks, definitive A or B or carrier reporting. For an adopted BSH-type cat without paperwork, this is a sensible one-time test to run before any planned anaesthetic procedure.

For full depth on cat blood types, NI, transfusion safety, and the BSH breeding implications, see our dedicated guide: British Shorthair Blood Type B Calgary.

Hemophilia B is an X-linked bleeding disorder caused by Factor IX deficiency. It was documented in a BSH family in 1993 by Maggio-Price and Dodds, published in the Journal of the American Veterinary Medical Association (203(12):1702-1704) and indexed on PubMed as PMID 8307821. The condition is rare and is not a routine screening target in BSH.

The relevance for Calgary adopters is awareness rather than active screening. A BSH that bleeds excessively or unexpectedly after a routine procedure (spay, neuter, dental cleaning, biopsy) warrants a clotting workup including factor levels. Because the inheritance is X-linked, males are more often clinically affected; females are typically carriers. If your veterinarian is investigating an unexpected bleeding event in a BSH, the breed history of Hemophilia B is part of the relevant differential diagnosis. Treatment of any active bleeding event belongs entirely with your vet team. No medication, dosage, or product recommendation is made on this page.

Dental disease is reported as a common BSH issue, with gingivitis and periodontitis typically appearing in the age 5 to 8 window in predisposed lines. Some BSH families show severe disease requiring multiple extractions or full-mouth dental work by middle age. The mechanism is not unique to BSH but the breed is over-represented in clinical caseloads at the more severe end of the spectrum.

The BSH dental schedule

• Annual oral exam from age 2 at the wellness visit. Catches early gingivitis when it is still reversible with cleaning.
• Professional cleaning every 1 to 2 years once any visible gingivitis or tartar is documented, typically starting around age 5 to 8.
• Home brushing with feline-safe paste, ideally started in kittenhood. Helps slow disease but does not prevent it in predisposed lines.
• Any reluctance to eat, dropping food, drooling, or visible red gum margins is a same-week vet call, not a wait-and-see situation.

Conditions to watch for

• Gingivitis (red, inflamed gum line at the tooth base; reversible if caught early)
• Periodontitis (progression beyond gingivitis to bone and ligament damage; not reversible, only manageable)
• Feline odontoclastic resorptive lesions (FORLs), in which the tooth structure resorbs from the root upward; painful, treatable only by extraction

Calgary cost reality

A professional dental cleaning under anaesthesia at a Calgary general-practice clinic typically runs $400 to $800, including pre-anaesthetic bloodwork, anaesthesia, scaling, polishing, and recovery. Extractions add roughly $200 to $800 per tooth depending on complexity. A BSH needing multiple extractions in one session can land in the $2,000 to $3,500 range without insurance. Because BSH also carry the documented HCM risk, every dental anaesthetic event is a good prompt to confirm cardiology screening is current. Pre-anaesthesia blood typing is reasonable practice because of the high Type B prevalence (covered earlier).

BSH were bred for a compact, chunky, cobby build with heavy bone, broad chests, and dense muscle. The look is part of the breed standard, and many BSH naturally carry weight in the 9-to-17-pound range as healthy adults (males often larger, often 14 to 17 pounds; females typically 9 to 12 pounds). The downside of that build is that BSH are easily overfed and easily slide into genuine obesity, which is the most-reported BSH management issue in breed owner communities.

Why BSH obesity matters more than for an average cat

Obesity in any cat raises the risk of diabetes mellitus, osteoarthritis, urinary tract disease, and hepatic lipidosis if rapid weight loss occurs. In BSH specifically, obesity compounds two existing breed risks. It worsens HCM by raising cardiac workload, and it stresses joints already loaded by a heavy frame. A BSH carrying an extra two or three pounds is meaningfully more at-risk than a domestic shorthair carrying the same extra weight, because the BSH cardiovascular system is already operating with elevated baseline HCM risk.

The Calgary BSH weight management routine

• Portion control by weight, not by volume. Weigh the daily allotted dry food on a kitchen scale once, then transfer the measurement to a measuring cup so the daily ration is consistent.
• Scheduled feeding, not free-feeding. Two or three meals per day at fixed times. Free-feeding a BSH a bowl of dry food is the fastest path to weight gain.
• Monthly weigh-ins. Stand on a bathroom scale alone, then with the cat. Note the cat's weight in a phone log. Trends matter more than single readings.
• Interactive play 10 to 15 minutes twice a day. BSH are placid by temperament but will engage a wand toy at adult age if the routine is built in.
• Vet-monitored body condition scoring at the annual wellness visit. Ask your Calgary general-practice vet for the target body condition score and the daily calorie budget that maintains it.

The Royal Canin Academy publishes peer-reviewed feline weight management material that your Calgary vet can adapt for a BSH-specific feeding plan.

Routine procedures (spay, neuter, dental cleaning) remain manageable. The standard feline anaesthetic protocol is appropriate for BSH. The two add-ons are not breed-level contraindications, they are sensible pre-procedure preparations that reflect the documented BSH risk profile.

What a BSH-aware anaesthetic plan includes

• Pre-anaesthetic blood typing (UC Davis VGL DNA test or a clinic in-house typing card), so any unexpected need for transfusion can be met with type-matched blood
• Pre-anaesthetic bloodwork including renal panel (BSH carry the Persian-inherited PKD1 risk; baseline kidney function matters)
• Pre-anaesthetic echocardiogram for any BSH aged 2 or older before elective surgery, especially if a baseline cardiology screen is not yet on file
• Intraoperative cardiac biomarker monitoring (NT-proBNP) where indicated and available
• Standard intraoperative pulse oximetry, capnography, and blood pressure monitoring
• Active warming throughout the procedure (warmed IV fluids, forced-air warming blankets)
• Monitored recovery until the cat is fully alert

For complex cases or specialty procedures, Western Veterinary Specialist & Emergency Centre handles BSH-specific anaesthetic management on referral, including cardiology-aware planning for known HCM cats and pre-transfusion type-matching protocols.

BSH lifespan with proactive care is typically 12 to 17 years. Swedish insurance data (Agria, the largest published feline insurance dataset in Europe) shows a median life expectancy above 12.5 years across the insured BSH population. The number is meaningfully better than the breed averages for breeds with more aggressive cardiac profiles (Sphynx, some Maine Coon lines), and reflects two things: the BSH cardiac risk is real but generally slower-progressing than in some other at-risk breeds, and BSH owners who engage with veterinary medicine reach the upper end of the lifespan range with consistency.

What drives the upper end of the range

The BSH owners we work with whose cats live longest share a pattern. They built a relationship with one Calgary general-practice clinic early, did not skip annual wellness exams, started cardiology screening with a baseline echo at age 1 to 2 and repeated it on schedule, ran the PKD1 DNA test once and acted on the result, took dental disease seriously from age 5 onward, managed weight by portion control from kittenhood, and had pet insurance with dental coverage in place before any diagnosis. For that owner, a 14-to-16 year lifespan is a reasonable planning assumption. None of that requires panic. It requires consistency over a decade or more.

What drives the lower end

• Undiagnosed HCM is the leading premature-mortality cause. A cat without a baseline echocardiogram by age 2 may present in heart failure or with a saddle thrombus at an age when earlier diagnosis would have allowed years of medical management.
• Obesity left unmanaged compounds cardiac and joint stress, and is the most preventable accelerator of BSH decline.
• Untreated dental disease contributes to systemic health decline over years and is itself painful.
• Pre-existing condition exclusion from insurance bought late means owners face the full out-of-pocket cost of HCM or PKD management and sometimes cannot sustain it.

BSH are pet-insurance-positive because the breed's combination of elevated cardiac risk, Persian-inherited renal risk, dental disease tendency, and 12-to-17-year lifespan compounds cost into the cat's years. A few directional figures to plan around (these are 2026 Calgary estimates, not quotes from any specific provider):

• Baseline cardiology echocardiogram at age 1 to 2 at a Calgary specialty centre: typically $400 to $600
• Repeat echocardiograms every 1 to 2 years until age 7, then annually: $400 to $600 each
• UC Davis VGL PKD1 DNA test (one-time, if adopting without paperwork): $44 alone, $66 bundled with PRA-pd
• UC Davis VGL feline blood type DNA test (one-time, before any anaesthetic procedure): $45 to $60
• Professional dental cleaning every 1 to 2 years: $400 to $800 per cleaning, plus $200 to $800 per tooth for extractions if indicated
• HCM management if diagnosed: varies widely with stage. Discuss specifics with your Calgary veterinarian.
• PKD progression management if diagnosed: chronic kidney disease care. Discuss specifics with your veterinarian.
• Emergency visit for open-mouth breathing, saddle thrombus, or unexpected bleeding: easily $1,500 to $3,000 for one night

Canadian carriers and premium ranges

Trupanion, Petsecure, and Pet Plus Us are the Canadian carriers BSH owners typically consider. Monthly premiums of $55 to $95 are typical for a healthy BSH enrolled before age 3. Premium rises if the policy is purchased after a diagnosis is on file. The base policy is the foundation; the dental add-on rider is worth considering for BSH because dental disease is a documented breed concern.

The pre-existing condition rule

Every Canadian pet insurance provider excludes pre-existing conditions. For a BSH, the timing is sharper than for an average cat:

• Cardiac change noted on the first baseline echo with no prior policy: HCM and related cardiac coverage permanently excluded on any new policy
• Renal cysts noted on imaging or PKD1 positive with no prior policy: chronic kidney disease coverage may be excluded indefinitely
• Gingivitis noted at a dental exam with no prior policy: dental coverage may be excluded indefinitely

Enrol at adoption or by the first vet visit, ideally before age 3. The cost of waiting is not the premiums saved, it is the coverage lost on the conditions you are most likely to need.

Cardiology, complex dental surgery, internal medicine, and emergency care for BSH usually involve referral from your general-practice vet to a specialty centre. The Calgary clinic that handles most BSH-relevant specialty work:

Your relationship with one general-practice clinic matters more than picking the “best” one. A vet who knows your BSH's baseline catches subtle changes that a one-time specialist visit misses. The specialist comes in when something specific is needed: the baseline HCM echocardiogram, a complex dental cleaning, a transfusion or pre-transfusion typing question, or an emergency.

For routine spay, neuter, vaccines, dental care, and wellness exams, any Calgary general-practice veterinary clinic you trust is appropriate. The BSH-specific layer (cardiology screening from age 1 to 2, PKD1 DNA testing once, blood typing before any anaesthetic, weight management) is where the partnership between general-practice and specialty referral matters.

BSH are medium-to-large cats (9 to 17 pounds adult; males often at the larger end), so emergency gear runs a touch bigger than the typical cat kit. The basics to keep in one accessible place:

• Cat carrier sized for a chunky breed. A 24 by 16 inch hard-sided carrier rated for car travel handles a larger male BSH comfortably, roughly $70 to $140. A familiar carrier left open in the home throughout the year is less stressful in an emergency.
• Printed copy of your pet insurance policy. Including policy number and after-hours contact.
• Recent photo of your cat. For identification if a carrier opens during transport. Note any distinguishing markings.
• Vaccination records. Most Calgary emergency clinics ask for current vaccine status on intake.
• Blood type record. Specific to BSH: if your cat has been blood-typed (UC Davis VGL DNA test or in-clinic typing card), include the type in the kit. A known Type B record saves critical minutes if transfusion becomes necessary at an emergency clinic.
• Written list of known sensitivities and conditions. Any prior medication reactions, PKD1 DNA test result, HCM screening history, dental history, any known anaesthesia issues. This list saves time when the cat cannot speak for itself.
• After-hours vet phone number. Western Veterinary Specialist & Emergency Centre operates 24-hour emergency. Save the number in your phone and post it on the fridge.
• Latest cardiology report. Especially important for BSH aged 2 and over with any baseline echo on file. If your cat is brought in for breathing changes or collapse, the existing cardiology report saves critical time at triage.

Keep the kit in one place. A stressed owner during a same-day vet trip should not be searching through filing cabinets for paperwork.

The realistic budget for a healthy Calgary BSH, to discuss with your veterinarian and adjust based on the individual cat:

The cardiac and dental rows are why pet insurance matters for BSH. Without coverage, a single HCM diagnosis or a major dental case can cost five figures over a 14-to-17 year cat. With coverage purchased before age 3 and before the first baseline echocardiogram, the same diagnosis may cost a few thousand in deductibles and co-insurance over the cat's life. The breed-specific double-leverage: BSH sit mid-range for premiums (cheaper than Sphynx or Maine Coon) but carry meaningful documented risks, so the value-per-premium-dollar is favourable.