Hesitant to allow pets, but want to!

[TaRa Mehta]

Can ya'll share your "lessons learnt" about allowing pets in your rental property ? We have only had one rental property so far and have always had a "No Pet Policy". Now I'm getting ready to market my second one and I want to feel more comfortable to allow pets and increase my applicant pool. I guess I'm concerned about those folks who think it's ok to use the backyard as the "potty", and not bother to pick up. Anyway, your recommendations/suggestions will be very helpful. Thanks in advance ! 

1. What restrictions do you have with pets ? (animal types/breeds/weight etc)
2. What is the normal fee charged ? (one time deposit or monthly)

Thanks