Small breed

Cavalier King Charles Spaniel Growth Chart

Male adult weight13–18 lb

Female adult weight13–18 lb

Cavalier King Charles Spaniel puppies usually approach their 13–18 lb adult range near 12 months. Male and female ranges often overlap, so the weight-by-age chart in lb and kg is most useful as a trend across consistent weekly measurements.

Enter your puppy's details to see an adult weight range, growth chart, and confidence level.

Weight unit

lbkg

Expected Cavalier King Charles Spaniel puppy weight at key ages in lb or kg
Age	Typical male range	Typical female range
2 months (8 weeks)	2.3–5.5 lb1–2.5 kg	2.3–5.5 lb1–2.5 kg
3 months (12 weeks)	3.5–7.3 lb1.6–3.3 kg	3.5–7.3 lb1.6–3.3 kg
4 months (16 weeks)	4.6–8.8 lb2.1–4 kg	4.6–8.8 lb2.1–4 kg
5 months (20 weeks)	5.7–10.2 lb2.6–4.6 kg	5.7–10.2 lb2.6–4.6 kg
6 months (24 weeks)	6.6–11.5 lb3–5.2 kg	6.6–11.5 lb3–5.2 kg
7 months (32 weeks)	8.4–14 lb3.8–6.4 kg	8.4–14 lb3.8–6.4 kg
9 months (40 weeks)	10.1–16.4 lb4.6–7.4 kg	10.1–16.4 lb4.6–7.4 kg
1 year (52 weeks)	11.8–18 lb5.4–8.2 kg	11.8–18 lb5.4–8.2 kg

Cavalier King Charles Spaniel Growth Stages

Understanding the typical growth stages helps you know what to expect as your Cavalier King Charles Spaniel puppy grows.

Neonatal

0–2 weeks

Puppies are born with eyes and ears closed, relying entirely on their mother. Rapid weight gain occurs during this period.

Socialization

3–12 weeks

Eyes and ears open. Puppies begin to explore, play, and learn social behaviors. This is a critical period for development.

Juvenile

3–6 months

Rapid growth continues. Puppies become more independent, start teething, and develop coordination.

Adolescent

6–10 months

Growth rate begins to slow. Puppies reach sexual maturity and may test boundaries. Muscle mass develops.

Young Adult

10–12 months

Growth is nearly complete. Your puppy is filling out and approaching adult proportions.

Adult

12+ months

Your puppy has reached their full adult size. Weight should remain relatively stable with proper nutrition.

How much will my Cavalier King Charles Spaniel puppy weigh as an adult?

As a small breed, Cavalier King Charles Spaniels usually reach an estimated adult range of 13–18 lb overall. Sex matters: males typically finish around 13–18 lb and females around 13–18 lb. Track weekly weigh-ins to see whether your puppy trends toward the lower or upper end.

At what age is a Cavalier King Charles Spaniel fully grown?

Cavalier King Charles Spaniels are small dogs that typically reach most of their adult weight between 9 and 12 months. Cavaliers typically finish near 12 months with gradual coat and bone fill. Slight muscle or coat fill may continue briefly after height stabilizes, so weekly weigh-ins give a clearer picture than a single reading.

How accurate is a Cavalier King Charles Spaniel puppy weight chart?

Chart accuracy for Cavalier King Charles Spaniels depends on individual build. Differences in similar male and female ranges can shift results, since silky feathering can exaggerate apparent bulk. Weekly weigh-ins on the same scale and time of day typically improve estimate quality over time.