Minimum age for dogs or cats

[Tim Bartel]

I am just starting to accept applications from people with pets in my two 4-plexes. I am changing from my no-pet policy because of long vacancies, and I get many requests from would-be tenants with pets. I see lots of people saying in the forums that they will not allow puppies. I have Leigh Robinson's Landlording book which has a sample pet policy. The sample policy has minimum ages of 3 months for a cat, and 9 months for a dog. I assume the principle issues are potty-training and chewing for puppies, and potty-training for kittens.

My question: For a cat or dog, what minimum ages will you accept?