Cavalier King Charles Spaniel Size & Weight Chart: How Big Do They Get?
Written for general planning, not medical advice — no one at Argos Paws is a veterinarian. If something is wrong with your dog right now, call your vet or the nearest emergency clinic.
Quick answer: A full-grown Cavalier King Charles Spaniel typically weighs 10-18 lb (4.5-8.2 kg) and stands 12-13 in (30-33 cm) tall at the shoulder. Most reach their adult size by around 9-10 months.
Photo: Andreweatock · CC BY-SA 3.0 · via Wikimedia Commons
Cavalier King Charles Spaniels are a small, affectionate toy breed originally bred as companion dogs for nobility. They tend to be gentle and adaptable to apartment living.
History and origin
The Cavalier's ancestors were the small spaniels depicted in 16th- and 17th-century portraits of British royalty — most famously with King Charles II, who reputedly decreed that spaniels should be allowed into any public building, including Parliament. The modern breed was reconstructed in the 1920s by breeders seeking to restore the longer-nosed, flatter-skulled type seen in old paintings, distinguishing it from the shorter-faced King Charles Spaniel. The Cavalier was recognised separately by the UK Kennel Club in 1945 and by the AKC in 1995.
Temperament and personality
Cavaliers are one of the most consistently gentle and people-oriented breeds in existence. They adapt their energy level to their owner: equally happy on a long country walk or curled on a sofa all afternoon. Unlike many toy breeds, they are not prone to yappiness or possessiveness, and they rarely show aggression. The downside of this sociability is that Cavaliers can develop separation anxiety if left alone frequently — they were bred to be lap dogs, and that role still defines their emotional needs. They also retain a spaniel's instinct to follow a scent or a bird, so a secure garden or lead in open spaces is essential.
Training and socialisation
Cavaliers are one of the easier breeds to train: they are people-pleasing, treat-motivated, and rarely dominant. Short, positive training sessions from puppyhood establish good habits quickly. The main challenge is recall when a scent catches their attention — a well-practised recall command before any off-lead exercise is strongly advised. Socialisation is straightforward given the breed's natural friendliness, but early exposure to different environments still helps prevent timidity. Their sensitivity means that any harsh correction tends to be counterproductive and can undermine confidence.
| Size category | Small |
|---|---|
| Typical adult weight | 10-18 lb (4.5-8.2 kg) |
| Height at the shoulder | 12-13 in (30-33 cm) |
| Full grown by | 9-10 months |
| Life expectancy | 12-15 years |
Cavalier King Charles Spaniel weight chart by age (lb & kg)
Estimated weights for an average Cavalier King Charles Spaniel puppy, based on the typical growth curve for a small breed. Males usually track toward the top of each figure, females toward the bottom.
| Age | Weight (lb) | Weight (kg) |
|---|---|---|
| 2 months | ~5 lb | ~2.3 kg |
| 3 months | ~8 lb | ~3.6 kg |
| 4 months | ~10 lb | ~4.5 kg |
| 5 months | ~11 lb | ~5 kg |
| 6 months | ~13 lb | ~5.9 kg |
| 9-10 months (full grown) | 10-18 lb | 4.5-8.2 kg |
When does a Cavalier King Charles Spaniel stop growing?
As a small breed, Cavaliers typically reach adult weight by around 9-10 months. Smaller breeds like the Cavalier King Charles Spaniel reach full height and fill out fairly close together, so growth tends to look "done" all at once.
Use the Puppy Weight Predictor below — it's pre-loaded with the Cavalier King Charles Spaniel's growth curve, so just enter your puppy's current weight and age.
Predict your Cavalier King Charles Spaniel's adult weight
Enter your puppy's current weight and age to get an estimate based on this breed's typical growth curve.
Open the Puppy Weight PredictorHow much does it cost to feed a Cavalier King Charles Spaniel?
A typical adult Cavalier King Charles Spaniel (14 lb, average activity) needs roughly 448 kcal/day — about 0.3 lb (1.1 cups) of dry kibble per day, which works out to around $16/month at typical kibble prices. Fresh or subscription-style food usually costs more, around $179/month for the same dog. These are population-level estimates — use the calculator below for a number based on your dog's actual weight and food type, or see the Cavalier King Charles Spaniel feeding chart for puppy amounts by month.
Estimate Cavalier King Charles Spaniel food costs
Pre-filled with this breed's typical adult weight — adjust activity level and food type to get your monthly estimate.
Open the Dog Food Cost CalculatorBrowse dog food sized for a Cavalier King Charles Spaniel
Compare dry, wet, and breed-specific formulas — filter by your dog's size and life stage to narrow it down.
Browse dog food on Amazon(affiliate link)How old is my Cavalier King Charles Spaniel in human years?
The old "×7" rule doesn't hold up — small breeds like the Cavalier King Charles Spaniel age at their own rate, not a generic one. Use the calculator below, pre-set to this breed's size.
Convert your Cavalier King Charles Spaniel's age
Pre-filled with this breed's size category for a more accurate human-year estimate than a flat multiplier.
Open the Cavalier King Charles Spaniel Age CalculatorCommon health considerations
- Mitral valve disease is extremely common in this breed and a leading cause of early mortality — regular cardiac checks are recommended.
- Syringomyelia, a neurological condition related to skull shape, occurs at a higher rate in Cavaliers than most breeds.
- Patellar luxation and ear infections are also relatively common.
This is general breed-level information, not a diagnosis or a prediction for any individual dog. Talk to your vet about health screening and preventive care specific to your dog.
Is pet insurance worth it for a Cavalier King Charles Spaniel?
See a typical monthly premium for this breed and whether it would likely pay off against a major vet bill.
Cavalier King Charles Spaniel insurance costSimilar breeds
Based on energy level, living-space fit, and care needs, these breeds are closest to the Cavalier King Charles Spaniel:
Take our breed match quiz
Answer a few quick questions about your lifestyle and living space to see which breeds — not just the Cavalier King Charles Spaniel — actually fit best.
Take the Breed Match QuizFrequently asked questions
How much does a full-grown Cavalier King Charles Spaniel weigh?
A full-grown Cavalier King Charles Spaniel typically weighs 10-18 lb (4.5-8.2 kg), making it a small breed. Individual dogs vary within that range depending on sex, genetics, and body condition — use the Puppy Weight Predictor above for an estimate based on your specific puppy's current weight and age.
How tall is a full-grown Cavalier King Charles Spaniel?
A full-grown Cavalier King Charles Spaniel stands 12-13 in (30-33 cm) tall, measured at the shoulder (withers).
When does a Cavalier King Charles Spaniel stop growing?
As a small breed, Cavaliers typically reach adult weight by around 9-10 months. Height typically levels off a bit before this; smaller breeds like this one fill out relatively quickly once they reach height.
Is a Cavalier King Charles Spaniel a good first dog?
Yes — the Cavalier King Charles Spaniel is commonly recommended as a first dog. Nothing about the breed demands specialized handling experience, which is unusual enough among dogs that it's worth calling out directly.
How much exercise does a Cavalier King Charles Spaniel need?
Relatively little compared to most breeds. A couple of shorter walks a day is usually enough for a Cavalier King Charles Spaniel, though every dog still benefits from some daily activity.
Is a Cavalier King Charles Spaniel good with kids?
Yes, the Cavalier King Charles Spaniel is one of the more reliably kid-friendly breeds, generally patient and sturdy enough for boisterous play. Always supervise young kids with any dog regardless of breed reputation.
How much grooming does a Cavalier King Charles Spaniel need?
A moderate, manageable routine — weekly brushing covers most Cavalier King Charles Spaniels, with occasional baths as needed.