Cavalier King Charles Spaniel

Temperament & personality

Cavaliers are among the sweetest-natured dogs in the toy group. They are warm and steady companions, keen for company but rarely pushy or over-excitable, and they get on with almost everyone: children, strangers, other dogs, and cats. Aggression is genuinely rare in a well-bred, well-raised Cavalier.

That friendliness has a flip side. These dogs bond so tightly that they hate being left alone and may develop separation anxiety if regularly left for long stretches. They are best suited to a household where someone is around much of the day, or where the dog can go along for the ride.

They are bright and eager to please, which makes training easy, and they respond far better to gentle, reward-based methods than to any firmness. A little spaniel instinct remains, so some will chase birds or follow their nose on a walk, but this is a soft, adaptable dog rather than a driven working one.

Vaccination schedule

Cavalier puppies get the same core vaccines as any breed. The DHPP combination protects against distemper, hepatitis (adenovirus), parvovirus, and parainfluenza, starting at 6 to 8 weeks with boosters every 2 to 4 weeks until at least 16 weeks of age. Being small, Cavalier puppies are fragile if they catch parvo, so complete the full course before heavy outdoor exposure.

Rabies is given once between 12 and 16 weeks depending on where you live, followed by a booster at one year and then every 1 to 3 years. Until the puppy series is finished, keep your Cavalier away from unknown dogs and public parks.

For non-core vaccines, kennel cough (Bordetella) is worth considering if your Cavalier will attend daycare, boarding, or grooming salons, which sociable lap dogs often do. Leptospirosis is now a core vaccine recommended for every dog, with local risk and outdoor exposure only raising how much the annual booster matters. Your vet will tailor the schedule and, given the breed's heart risk, will also use these visits to listen to the chest.

Best food & diet

A small dog needs a small but nutrient-dense diet. Choose a complete food formulated for small or toy breeds, with a named meat protein as the first ingredient, and feed a growth formula until around 10 to 12 months. Because a Cavalier only eats a little, quality per mouthful counts more than in a big dog.

Weight control is a genuine health issue here, not a cosmetic one. Cavaliers love food and will happily overeat, and every extra gram strains a heart that is already prone to disease. Measure meals, go easy on treats, and keep the dog trim enough that you can feel the ribs under a light layer.

Beef, chicken, and dairy are common allergens in the breed, so if your dog develops itchy skin or ear infections, ask your vet about a controlled diet trial. Small breeds are prone to dental disease, so either use a diet that supports dental health or commit to regular tooth brushing, since bad teeth and heart disease often travel together.

Common health problems

Mitral valve disease is the defining health concern of the breed and the one every Cavalier owner must understand. It is a degenerative heart condition where a valve leaks, and in Cavaliers it appears unusually early, often by middle age and sometimes younger. A large proportion of Cavaliers develop a heart murmur in their lifetime. Annual heart checks from an early age are essential, and if your vet hears a murmur, the disease can be monitored and treated to give the dog good years.

The second major condition is syringomyelia, a painful neurological disorder where fluid-filled cavities form in the spinal cord. In Cavaliers it is linked to a Chiari-like malformation, a mismatch between the shape of the skull at the back of the head and the hindbrain that crowds the space and disrupts the normal flow of cerebrospinal fluid. Signs include scratching at the neck and shoulder (often without making contact), yelping in pain, and sensitivity around the head and neck. It ranges from mild to severe and needs veterinary diagnosis, often with an MRI scan.

Beyond these two, watch for a handful of minor conditions. Like many long, hairy, low-set-eared spaniels, Cavaliers can develop ear infections (otitis), and like many toy breeds they sometimes run into hip problems (hip dysplasia) and luxating patellas (slipping kneecaps). Eye conditions and dental disease can also crop up, so raise any of these with your vet. Buying from a breeder who heart-tests and MRI-screens their breeding dogs is the best way to stack the odds in your puppy's favor.

Allergies & skin

Like many companion breeds, Cavaliers can suffer from both food and environmental allergies. Food triggers such as beef, dairy, and chicken tend to show up as itchy skin, licked paws, and repeated ear infections rather than digestive upset, and a vet-guided diet trial is the way to confirm them.

Environmental allergens including grass pollen and dust mites cause atopic dermatitis, which often flares seasonally. Wiping the coat and paws after walks, washing bedding regularly, and keeping on top of flea control all reduce the itch load. Persistent scratching should be checked, partly because in this breed neck scratching can also be a sign of syringomyelia rather than a simple allergy.

The Cavalier's biggest skin-linked problem is flea allergy dermatitis. A single flea bite can set off intense itching in a sensitive dog, so year-round flea prevention is not optional. Those low, feathered ears also trap moisture and wax, making ear infections the most common skin-adjacent complaint, so check and clean them regularly.

Flea, tick & worm prevention

Year-round flea control is especially important for Cavaliers because so many are allergic to flea saliva. In a flea-allergic dog, one bite triggers days of scratching and can lead to raw, infected skin. Treat the dog on a strict monthly (or as directed) schedule and treat the home environment too if you ever see fleas, since most of an infestation lives in carpets and bedding, not on the dog.

Ticks are a risk on walks in grass and woodland. Use a product that covers ticks as well as fleas, and check the coat after country walks, remembering to look inside those long ears where ticks like to hide. Remove any tick promptly with a proper tick remover.

Worming follows the standard pattern: every 2 weeks for puppies until 12 weeks, then monthly to 6 months, then roughly every 3 months for adults. Include lungworm cover in the plan if you live in an at-risk area, as it is picked up from slugs and snails. Your vet can combine flea, tick, and worm protection into a simple routine suited to a small dog.

Medications & dosing

As a small breed, the Cavalier's low body weight makes accurate dosing critical, since a small error is proportionally large in a 5 to 8 kg dog. Always dose by current weight, use the exact product and strength your vet prescribes, and never give human medicines or another dog's tablets without veterinary advice. Many common painkillers safe for people are toxic to dogs.

Heart medication is a likely part of this breed's later life. When mitral valve disease progresses, vets commonly prescribe pimobendan to support heart function, often alongside other drugs as the condition advances. These are given long term and by weight, and skipping doses can undo the benefit, so build them into a daily routine and keep up the follow-up appointments.

Dogs with syringomyelia may need pain relief and nerve-pain medications tailored to the severity of their signs, always under close veterinary supervision. The MDR1 drug-sensitivity mutation is generally associated with herding breeds rather than Cavaliers, but discuss any drug sensitivities with your vet, and remember that their small size and high rate of heart disease mean every prescription, including routine sedation or anaesthesia, should account for cardiac status. Tell your vet about any known heart murmur before a procedure.

Grooming & coat care

The Cavalier has a medium-length silky coat with feathering on the ears, chest, legs, feet, and tail. It sheds a moderate amount year-round and is not hypoallergenic. Brush two or three times a week to keep the feathering free of tangles, paying particular attention behind the ears and on the legs where mats form first.

Those long, hairy ears need dedicated care. They hang down and trap moisture, so check them weekly and clean them as your vet advises to head off the ear infections this breed is prone to. Keep the hair between the paw pads trimmed, and bath the dog when it gets dirty, following up with a thorough dry and brush-through.

Trim nails every few weeks, and brush the teeth several times a week, since small breeds like the Cavalier are prone to dental disease, and healthy teeth support overall wellbeing. Grooming time doubles as a health check, so use it to run your hands over the body and around the neck, where scratching or tenderness can flag a problem worth a vet visit.

How the Cavalier King Charles Spaniel compares

Deciding between similar breeds? Here is the Cavalier King Charles Spaniel next to Dandie Dinmont Terrier and Norfolk Terrier.

Frequently asked questions