Large Breed Dogs Reach Adulthood Later Than Small Breed Dogs
The enormous difference in adult size between a Great Dane and a Chihuahua means that Great Danes have a lot more growing to do during their first year of life! It also means that small and medium dogs reach adult size at about 1 year of age, while large and giant breeds continue to develop until they are 1 ½ to 3 years of age. A good rule of thumb is to continue to feed your puppy a complete and balanced puppy food selected for his breed size until he is at least 80% or greater of his expected adult body weight.
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