These are fairly slow maturing dogs, reaching adult height by about one year of age but not filling out totally until two or three years. Many Old English sheepdogs live to 12 or 14 years of age.

How big do Sheepdogs get?

Males stand 22 inches tall and weigh 80 to 100 pounds. Females stand 21 inches tall and weigh 60 to 85 pounds.

At what age is an OES fully grown?

These dogs are slow growing with a tendency to reach their adult heights at about 1 year old, but they continue to add muscle and bulk, not filling out to their full adult weights until they are 2 or 3 years old.