Toy / Small Dogs—Roughly ranging up to 20 pounds (9 kg) Medium Dogs—Roughly ranging from 20-50 pounds (9-23 kg) Large Dogs—Roughly ranging from 50-100 pounds (23-45 kg) Extra-Large Dogs—Can get to be over 100 pounds (45 kg)
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But, in general, small dog breeds tend to go up to about 20 pounds, and large dog breeds begin around 60 pounds. So anything in the middle could be considered a medium-sized dog. Because of this wide weight range—20 to 60 pounds—medium-size dogs make up a large portion of the breeds in existence.