Puppy in apartment, lease says no, advice wanted

[Carole G.]

We have a tenant who has a puppy, even though her lease says no pets.  She is claiming it is a service dog in training.  The Scottsdale library doesn't allow "service dogs" who pee and poop where they shouldn't.  I don't think this tenant can claim "service dog" and get away with it legally.  The problem is it is peeing on the floors, which are mostly tile, but bedrooms are carpeted, and the tenant isn't picking up the poop in the yard.  

We have told her to get rid of the dog, but she won't return our calls now.  Would you give her a 5-day notice for breaking the lease?  Or how would you handle it?