they got a puppy

[Anthony Varner]

Hi BP people,

The lease says no pets and tenants agreed to no pets.  Thing is, it's a duplex and I live upstairs, so I can hear what's going on below.  I've heard a puppy barking for a few days now and yes it's possible they are dog-sitting and it's temporary (but they STILL should have gotten my permission first), or they simply have a pet now and are trying to hide it.  

If I allowed them to keep the dog, what is standard? Just have them pay a pet deposit?  Or add something to the monthly rent?

Ideally I wouldn't want any dogs/cats in the place because of the hardwood floors (urine) and whatever else such as chewing on corners of doors, etc.  But it sounds like a very small dog so might not be a huge deal.  

How would you approach this situation?   Anyone with some experience in this area, I'd really appreciate any tips.

Thanks in advance.

AJ Varner