Medium Sized Dogs Weight Range. Dogs weighing around 30 pounds (14 kg) or less are generally considered small dogs and any breed over 55 pounds (25 kg) is usually considered a large dog. Medium dogs weigh between 20 and 60 pounds.

In 1880, the american spaniel club was founded, and anything over 28 pounds. Royal canine defines a medium breed dog as 24 to 55 pounds and a large dog to be over 55 pounds. According to pet place, medium breed dogs weigh from 35 to 65 pounds and large breeds as those over 55 pounds.