When do Black and Tan Coonhounds stop growing?

Black and Tan Coonhounds stop growing in height by around 12 to 15 months of age. However, they might continue to fill out and gain muscle mass until they are about 18 to 24 months old. Like many large breeds, they mature more slowly than smaller dogs, so they might not reach their full physical and mental maturity until they’re about two years old.