When do English Cocker Spaniels stop growing?

English Cocker Spaniels generally reach their full height by around nine months, though they’ll continue filling out and building muscle until they’re about a year old. By this point, they’re typically at their adult size.

Around the nine- to 10-month mark, transitioning from puppy food to adult food is ideal to support their shifting metabolic and health needs. Consistent exercise, mental enrichment, and positive socialization throughout their growth phase will help them develop into healthy, happy adults, ready for a lifetime of adventure with their families.