Cavaliers in Ontario: what the law asks and where hearts get checked

The main statute is the Provincial Animal Welfare Services Act, 2019, usually shortened to the PAWS Act. The everyday detail sits in its standards-of-care regulation, O. Reg. 444/19, which sets out what any owner must provide. None of it is breed-specific. It applies to a Cavalier in a Mississauga condo exactly as it applies to a farm collie.

In 2024 the province passed the Preventing Unethical Puppy Sales Act, which amends the PAWS Act and makes it an offence to operate a puppy mill. According to a summary published by Animal Justice, the conditions that count include separating puppies from their mother before eight weeks and breeding females younger than one year. The PAWS Act itself sets the minimum fine at $10,000, rising to $25,000 where a dog dies or has to be euthanized.

Check the current text of the 2024 amendment on Ontario's e-Laws site for its in-force date, and in the meantime treat the eight-week line as the minimum any reputable breeder already keeps, not as a rule a court has tested. The breeder checklist covers what a good one does on top of it.

The third piece is older and much clearer. Under R.R.O. 1990, Reg. 567 under the Health Protection and Promotion Act, every dog, cat and ferret aged three months or older must be vaccinated against rabies, a rule that has applied province-wide since O. Reg. 497/17. The vet issues a certificate and a tag. A puppy bought at eight weeks will reach that age within a few weeks of coming home, which is why the first-months schedule puts the rabies shot early.

Mitral valve disease is the reason Cavalier owners talk about cardiologists the way other dog owners talk about groomers. The Cavalier King Charles Spaniel Club of Canada recommends screening by a cardiologist from age one, using auscultation together with an echocardiogram, and says plainly that a routine vet visit is not sufficient for heart screening. The full reasoning is on the health testing page.

Ontario has the advantage of the OVC Cardiology Service at the University of Guelph. It offers echocardiography, X-rays, ECG and Holter monitoring, and states that it has two of only 25 board-certified specialists in veterinary cardiology in Canada. That figure is worth sitting with: across the whole country, the number of people qualified to read a Cavalier's heart to breeding-clearance standard is small.

Guelph is also where a long-running study, active since 1992, has looked for a DNA marker for the breed's heart disease. The national club reports that none has been found. So there is still no cheek-swab answer, and a breeder's heart certificate still has to come from a specialist exam.

The club's advice covers a pet that is not going to be bred as well. Where a specialist visit is hard to arrange, many owners in practice ask their regular vet to listen at every annual visit and get a referral to a cardiologist if a murmur appears. Bring the dog's previous results along, because the change over time tells a specialist more than a single reading.

Southern Ontario has its own regional Cavalier club with a public website. That is a better starting point than any classified site, because club members can tell you who is planning a litter and who actually tests. The national club's directory and the CKC Puppy List cover the rest of the province, including the north, where breeders are fewer and far between.

If you would rather adopt, the national club's rescue is small and usually places older dogs. The Ontario SPCA is the general welfare body for the province.

A Cavalier adapts well to Toronto, Ottawa or Hamilton apartment life because it needs company far more than it needs a yard. Two good walks a day and a chance to sniff are enough for most adults. The breed's general profile describes the temperament in more detail; in short, it will greet the concierge, the courier and the toddler in the elevator with the same enthusiasm.

The harder months are not only the winter ones. Spring melt along waterfront paths leaves grit and puddles that work their way into the feathering on the legs and ears. Summer at the cottage brings lakes, docks and long car rides. A Cavalier is a willing swimmer in some cases and a nervous one in others, and a small dog on a dock is easy to lose sight of.

Before a long drive north, check that the rabies tag is on the collar. If the dog has a known murmur, ask your vet whether a full day of heat and excitement is a good idea, and pack water and a shaded crate for the trip.

Ears deserve a look after any swim. The grooming guide shows how to dry and comb them without pulling the feathering.

Readers deciding between a Cavalier and a Shetland Sheepdog often ask whether Ontario has a Sheltie club. The Canadian Shetland Sheepdog Association lists no member club for Ontario. There is, however, the Southern Ontario Sheltie Rescue Society, a registered charity in Burlington, established in 2003, that places dogs through foster homes, according to its Halton community directory listing, and also takes Rough and Smooth Collies.

It does not take Cavaliers. If both breeds are on your shortlist, the side-by-side page Cavalier or Sheltie sets out the differences in coat, energy and health.