How old is a schnauzer to eat adult dog food Schnauzer should be replaced with adult dog food by one and a half years of age. A schnauzer dog is equal to a human’s 17 years of age at one year of age, and a schnauzer is equal to a human’s 20 years of age at one and a half years of age. So at 1 1/2 years old at the latest, dog owners should switch their Shelties from puppy food to adult dog food. This is because by this time the Sheltie has become strong enough. Generally speaking, the six months after the birth of a Sheltie puppy are very critical because these stages will determine the dog’s personality. Also each year of Chenery’s age grows approximately equal to 4-5 years of age for a human.
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