Cavalier King Charles Spaniel Puppy Weight Calculator

Calculate the adult weight for your Cavalier King Charles Spaniel. Just type your puppy’s current weight and age, and see how big your puppy gets.

Cavalier King Charles Spaniel Growth Guide

Breed Overview

The Cavalier King Charles Spaniel is a charming and affectionate toy breed that originated in the United Kingdom. Originally bred as a companion dog for royalty and nobility, this spaniel is known for its sweet temperament, graceful appearance, and silky, feathered coat. Cavaliers are sociable, gentle, and eager to please, making them excellent family pets and therapy dogs.

As a small breed, the Cavalier typically reaches adult size relatively early. Monitoring their growth helps ensure they maintain a healthy weight, as this breed is prone to obesity and certain hereditary health issues that can be managed or avoided with careful tracking during puppyhood.

Learn more from the American Kennel Club or the Cavalier King Charles Spaniel Club

Cavalier King Charles Spaniel Growth Chart & Weight Ranges

Here’s a general guide to average puppy weights by age for Cavaliers. Males typically weigh 1–3 lbs more than females as adults.

Age	Average Weight (Male)	Average Weight (Female)
4 weeks	1.5–2.5 lbs	1.2–2.2 lbs
8 weeks	3–5 lbs	2.5–4.5 lbs
3 months	5–7.5 lbs	4.5–7 lbs
4 months	6.5–9.5 lbs	6–8.5 lbs
6 months	9.5–13 lbs	8.5–12 lbs
9 months	11–15 lbs	10–14 lbs
12 months	13–18 lbs	12–17 lbs
Adult (14+ months)	13–20 lbs	12–18 lbs

How Much Bigger Will My Cavalier Puppy Get?

Cavalier King Charles Spaniel puppies grow quickly during their first six months. Most reach 50% of their adult weight by around 3–4 months and are 80–90% grown by 9–10 months. Full physical maturity usually occurs between 10 and 12 months, though some may continue to fill out slightly until 14 months.

Rule of Thumb:
To estimate adult weight, double your Cavalier’s weight at 16 weeks. For instance, a puppy weighing 6 lbs at 4 months may reach about 12–14 lbs as an adult.

Unlike giant breeds, Cavaliers complete their growth cycle within the first year, making early nutrition and weight tracking especially important.

Cavalier King Charles Spaniel Growth Tips

Nutrition

Feed a small-breed puppy formula that supports healthy metabolism and bone development. Serve 3–4 small meals per day until 6 months of age, then transition to 2 meals daily. Monitor treat intake and avoid overfeeding, as Cavaliers are prone to weight gain.

Exercise

Although not high-energy, Cavalier puppies need daily moderate play and short walks. Avoid high-impact or overly strenuous activity during the early months. Interactive toys and basic obedience training also provide valuable mental stimulation.

Health Watch

Cavaliers are genetically predisposed to mitral valve disease (MVD), patellar luxation, and hip dysplasia. Keeping them lean and well-exercised reduces stress on joints and the heart. Schedule regular vet checkups and discuss early screening options for hereditary conditions with your breeder or vet.