According to the FCI standard, its name recalls a favourite dog of King Charles II; in some countries it is called the English Toy Spaniel. It shares its origins and name with the better-known Cavalier, but not its face: the King Charles Spaniel has a strongly domed skull over a short, upturned nose. The implications of this head shape have now been measured in detail.
| FCI | Group 9 (Companion and Toy Dogs), Section 7 English Toy Spaniels, Standard No. 128, without working trial |
|---|---|
| Country of origin | Great Britain |
| Size (height at the withers) | not specified in the FCI standard |
| Weight | 3,6 to 6,3 kg |
| Life expectancy | no reliable study figure found (N/A); grouped with the Cavalier in McMillan et al. 2024 |
| Coat | long, silky and straight, slight wave allowed, never curly; legs, ears and tail well feathered |
| Colours in the standard | Black and Tan, Tricolour (pearl white with black and tan), Blenheim (pearl white with chestnut red) and Ruby (solid chestnut red); other colours not permitted |
Little hunting dogs for wealthy homes
The standard tells the story this way: toy spaniels in England and continental Europe were bred progressively smaller from setter-like dogs. Originally little hunting dogs, they were pampered by wealthy owners and crossed with toy dogs from the East, hence the face. Ruby King Charles Spaniels later contributed to the Belgian griffons, such as the Griffon Belge. The standard calls the Cavalier King Charles Spaniel an obvious relative.
What the 2026 standard says
The FCI revised the standard in September 2026. It requires a black, short, upturned nose with large, wide-open nostrils, a broad, upturned muzzle and a slight undershot bite; a protruding tongue is highly undesirable. Eyes should be relatively large. Naturally short or kinked tails are tolerated.
Breathing: better than feared, but not good
Cambridge vets measured 83 King Charles Spaniels whose muzzles averaged only one twentieth of skull length. Yet in an exercise test for brachycephalic obstructive airway syndrome (BOAS), 39,8 per cent had no signs, 42,2 per cent mild signs and 18,1 per cent moderate signs, with none severe (Tomlinson et al. 2026). The authors rate this as moderate risk, lower than the head shape would suggest.
Eyes, folds and kneecaps
The same study found a nasal fold in 77,9 per cent, conspicuously visible eye whites in 54,7 per cent and a loose kneecap (patellar luxation) in 34,1 per cent. In another British study, nasal folds were associated with an almost fivefold risk of corneal ulcers (Packer et al. 2015). Keep the fold dry and check the eyes daily.
A tail with unanswered questions
Finnish researchers included 47 King Charles Spaniels in a genetic study because malformed tail vertebrae are common in the breed. None carried the DVL2 variant behind bulldogs’ screw tails; the cause remains unknown (Niskanen et al. 2021).
Gentle, reserved and affectionate
Happy, intelligent, reserved, gentle and affectionate: that is the standard’s description. Short walks and calm search games suffice. Feathered ears and paws need combing and brushing several times a week.
Who can meet its needs
People seeking a quiet, friendly companion, who keep it slim and ask the breeder to show breathing tests, knee results and eye examinations for both parents.
When to keep looking
If you see the shorter face as merely a matter of style. With this face, the parents’ characteristics influence every breath.
Before settling on a breed, the breed quiz offers an initial direction; our book explores further: “Welcher Hund passt WIRKLICH zu dir?” (book in German). If a gentle toy spaniel appeals, look at the Papillon , and for a calm temperament with long hair, the Bolognese; both have a distinctly longer muzzle. Find more breeds in the Dog Breed Encyclopedia. Shelters and rescue organisations also have small dogs. The free Puppy Starter Pack helps you get started.
Further reading
- Cavalier King Charles Spaniel: perfect temperament, ailing heart
- Pug: what a nose bred away means in daily life
- Is my dog overweight? Checking body shape and ideal weight
Sources, accessed on 20.10.2026: FCI-Standard Nr. 128 King Charles Spaniel (fci.be, English version dated 06.10.2026, no German version); Tomlinson F et al., A cross-sectional study into the prevalence and conformational risk factors of BOAS across fourteen brachycephalic dog breeds, PLOS ONE 2026; Packer RMA et al., Impact of facial conformation on canine health: corneal ulceration, PLOS ONE 2015; Niskanen JE et al., Canine DVL2 variant contributes to brachycephalic phenotype and caudal vertebral anomalies, Human Genetics 2021; McMillan KM et al., Longevity of companion dog breeds: those at risk from early death, Scientific Reports 2024.
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