Pets, pet policies, pet insurance?

[Chelsea John-Williams]

I just bought my first rental property, fixed it up and posted an ad that on Craigslist/ Zillow. I have heard the horror stories about pets ruining properties so I wanted to allow small pets under 35 pounds but also require a pet insurance policy for the liability and a $250 deposit non refundable for the wear and tear. Too aggressive?? I appreciate all the input as I am still learning landlording.