Sussex Spaniel Weight & Growth Chart

Complete weight guide with growth charts for male and female Sussex Spaniels from puppy to adult.

Male Adult Weight

35–45 lbs

Female Adult Weight

29–39 lbs

Sussex Spaniel Weight Overview

A fully grown Sussex Spaniel weighs between 35 and 45 pounds. Males range 35–45 lbs; females 29–39 lbs.

Males 40-44 lbs, females 35-40 lbs. Heavy for their height at 13-15 inches. Must be kept lean to protect the spine. The heaviest spaniel per inch of height..

Growth Chart

When Does a Sussex Spaniel Stop Growing?

Sussex Spaniels typically reach their full adult height of 13–15 inches by 12 to 15 months and their full adult weight of 35–45 lbs shortly after. Males 40-44 lbs, females 35-40 lbs. Heavy for their height at 13-15 inches. Must be kept lean to protect the spine. The heaviest spaniel per inch of height..

Factors that influence growth include genetics, nutrition, and spay/neuter timing. Dogs spayed or neutered very early may grow slightly taller due to delayed growth plate closure.

Is My Sussex Spaniel Overweight?

Assessing your Sussex Spaniel's body condition (healthy range: 35–45 lbs):

Rib check: Run your hands along the ribcage—you should feel individual ribs under a slight fat layer
Overhead view: A defined waist should be visible between ribs and hips
Side profile: The abdomen should tuck upward behind the last rib

Overweight Sussex Spaniels face higher risks of Intervertebral Disc Disease, joint problems, and shortened lifespan. Even for a medium-sized breed, excess weight significantly impacts joint health and overall wellbeing. Work with your vet to adjust feeding and exercise if needed.

Feeding Recommendation

Feed an adult Sussex Spaniel approximately 0.5–0.9 cups of quality kibble daily, split into two meals. Males (35–45 lbs) may need slightly more than females (29–39 lbs). Males 40-44 lbs, females 35-40 lbs. Heavy for their height at 13-15 inches. Must be kept lean to protect the spine. The heaviest spaniel per inch of height.. With moderate energy (2/5), portions at the middle of guidelines usually suffice.

Weight by Age Table

Age	Male (lbs)	Female (lbs)
3 months	10.3–12.2	8.7–10.4
6 months	22.6–26.9	19.2–22.9
9 months	32.9–39.1	27.9–33.3
12 months	41.1–48.9	34.9–41.6

Frequently Asked Questions

Males: 35–45 lbs. Females: 29–39 lbs. Males 40-44 lbs, females 35-40 lbs. Heavy for their height at 13-15 inches. Must be kept lean to protect the spine. The heaviest spaniel per inch of height.. Consult your vet for a personalized assessment.

Most Sussex Spaniels reach adult height of 13–15 inches by 12–15 months, with full body weight of 35–45 lbs achieved shortly after. Males 40-44 lbs, females 35-40 lbs. Heavy for their height at 13-15 inches. Must be kept lean to protect the spine. The heaviest spaniel per inch of height..

Three quick checks for your Sussex Spaniel: (1) Feel the ribs–they should be easily palpable under a thin fat layer. (2) View from above–there should be a visible waist behind the ribs. (3) Side profile–the abdomen should tuck up. Target weight: 35–45 lbs. Their coat type allows for relatively easy visual body condition assessment. Consult your vet for a body condition score.

Feeding amounts depend on age, current weight, and the Sussex Spaniel's expected adult size of 35–45 lbs. Puppies under 6 months need 3–4 meals daily; older puppies eat twice daily. A high-quality puppy food formulated for medium breeds provides the right nutrient balance. The breed's long back and short legs create orthopedic vulnerabilities. Maintaining lean body weight is crucial for spinal health..

Poor weight gain in a Sussex Spaniel puppy warrants a vet visit. For a breed that should reach 35–45 lbs at maturity, slow growth can signal parasites (very common in puppies), underfeeding, food intolerance, or illness. Regular weigh-ins help track progress objectively. Your vet will likely run a fecal test and blood work.