How big does a Cavalier King Charles Spaniel get?

A full-grown Cavalier King Charles Spaniel typically stands 30–33 cm (11.8–13.0 inches) tall at the shoulder and weighs 6–8 kg (13.2–17.6 lbs). Cavalier King Charles Spaniel is a small breed and usually reaches full size by 12 months.

What is the lifespan of a Cavalier King Charles Spaniel?

The average lifespan of a Cavalier King Charles Spaniel is 12–15 years. Smaller breeds tend to live longer than larger breeds. Maintaining a healthy weight is one of the most important factors in extending your dog's lifespan — overweight dogs can lose 1–2 years of life expectancy.

What are the personality traits of a Cavalier King Charles Spaniel?

Cavalier King Charles Spaniel are known for being affectionate, gentle, graceful, patient. They are generally good with children and make excellent family dogs. They are highly trainable and eager to please. Their size and energy level make them suitable for apartment living.

Is a Cavalier King Charles Spaniel a good choice for apartments and families?

Yes, a Cavalier King Charles Spaniel can adapt well to apartment living due to their small size and moderate energy levels. They are generally good with kids and make great family companions. They shed moderately, with weekly brushing usually sufficient. They are easy to train, making them great for first-time dog owners.

What are common health issues for small breed dogs like the Cavalier King Charles Spaniel?

Small and toy breeds like the Cavalier King Charles Spaniel are prone to dental disease, patellar luxation (knee issues), tracheal collapse, and hypoglycemia. They can also develop heart valve disease as they age. Keeping your dog at an ideal weight is the single most effective way to reduce the risk of many of these conditions. Use our BCS assessment tool above to check your dog's condition.

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Cavalier King Charles Spaniel Weight & Calorie Guide

Q: How many calories does a Cavalier King Charles Spaniel need per day?

A typical adult Cavalier King Charles Spaniel weighing about 7 kg needs approximately 482–602 kcal per day, depending on activity level and neuter status. Puppies and very active dogs need more, while seniors and neutered dogs need less. Use our breed-specific calculator for an exact number.

Small Breed

Quick Answer

A healthy adult Cavalier King Charles Spaniel weighs 6–8 kg (13.2–17.6 lbs), according to the AKC breed standard. Puppies reach 50% of adult weight by 4–5 months and full weight by 9–10 months.

Source: AKC breed standard, WSAVA nutrition guidelines

Quick Facts

Ideal Weight

6–8 kg

(13.2–17.6 lbs)

Size Category

small

Breed Type

Daily Calories

~482–602 kcal

Adult, neutered

Free Tools

BCS Assessment Calorie Calculator

Ideal Weight Range

6 kgto8 kg

13.2 lbsto17.6 lbs

UnderweightIdealOverweightObese

Data:AKC breed standard·WSAVA guidelines

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Puppy Weight Predictor

For puppies under 12 months. Enter your puppy's current weight and age to predict adult weight.

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How the puppy weight predictor works

This predictor uses growth milestone data from Salt et al. (2017), published in Veterinary Record, which tracked the weight development of dogs across five size categories from birth to adulthood. By comparing your puppy's current weight against the expected growth percentage for their age and size category, we estimate their adult weight range.

Factors that affect adult weight

Genetics play the largest role, but nutrition, neutering status, and overall health also influence growth rate. Puppies fed excessive calories during rapid growth phases may exceed their genetic weight potential, while underfed puppies may not reach it. Large and giant breeds grow more slowly than toy and small breeds, reaching full size at 18–24 months rather than 10–12 months.

Data source: Salt et al. (2017) "Growth patterns of commercial kennel dogs" Veterinary Record • AKC breed standards

Cavalier King Charles Spaniel Health & Weight Management

Cavalier King Charles Spaniels are among the most obesity-prone small breeds. Their compact frame means even 1–2 extra pounds place significant strain on the heart — critically important for a breed already predisposed to mitral valve disease (MVD), the leading cause of heart failure in Cavaliers. Excess weight also worsens syringomyelia symptoms and accelerates patellar luxation.

Exercise: Moderate daily exercise of 20–30 minutes is ideal — gentle walks and short play sessions. Avoid over-exertion in hot weather due to potential cardiac limitations. Swimming is a good low-impact option if your Cavalier enjoys water.

Feeding tips: Cavaliers are notorious food beggars. Measure food carefully using a kitchen scale — a "slight extra scoop" can add 15–20% more calories than intended. Split meals into two portions daily. Use low-calorie treats like carrot sticks or green beans instead of commercial biscuits.

Keeping your Cavalier at a lean 13–18 lbs (6–8 kg) is especially important for heart health. Use PawScale's calorie calculator for Cavaliers to find the right daily intake, check their body condition with our BCS tool, and create a balanced meal plan with the feeding guide.

Data source: AKC breed standard • Last updated: 2026-08-12

Is your Cavalier King Charles Spaniel at a healthy weight?

59% of dogs are overweight — can you tell? Take our free 2-minute Body Condition Score assessment.

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Cavalier King Charles Spaniel Calorie Calculator

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Frequently Asked Questions

How much should a Cavalier King Charles Spaniel weigh?

The ideal weight for a Cavalier King Charles Spaniel is 6–8 kg (13.2–17.6 lbs). Even a small weight gain can be significant for smaller breeds. Use our calorie calculator above to get personalized feeding recommendations.

How many calories does a Cavalier King Charles Spaniel need per day?

A typical adult Cavalier King Charles Spaniel weighing 7 kg needs approximately 482–602 kcal per day, depending on activity level and whether they are neutered. Use our breed-specific calculator above for an exact number based on your dog's details.

Is my Cavalier King Charles Spaniel overweight?

59% of dogs are overweight, and most owners cannot tell just by looking. Check your Cavalier King Charles Spaniel's Body Condition Score (BCS) — if you can't easily feel their ribs or they have no visible waist from above, they may be overweight. Take our free 2-minute BCS assessment above to find out.

When does a Cavalier King Charles Spaniel reach full adult weight?

Cavalier King Charles Spaniel puppies reach 50% of their adult weight by 4–5 months and typically reach full adult weight by 9–10 months, according to AKC growth guidelines. Small breeds mature faster than large breeds.

What size crate does a Cavalier King Charles Spaniel need?

A Cavalier King Charles Spaniel typically needs a 24-inch crate based on breed size. Use PawScale's free crate size calculator for a personalized recommendation.

References & data sources

1. AKC Official Breed Standard — Cavalier King Charles Spaniel. akc.org

2. Salt C, et al. “Estimating the expected growth of dogs.” Vet Record, 2017;180(15):376.

3. National Research Council. Nutrient Requirements of Dogs and Cats. National Academies Press, 2006.

4. Laflamme DP. “Development and validation of a body condition score system for dogs.” Canine Practice, 1997;22(4):10–15.

5. WSAVA Global Nutrition Guidelines; Association for Pet Obesity Prevention (APOP) 9-point BCS scale.

Last reviewed: September 2026

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