I have a dog myself and, therefore, will have to allow pets in other units as well. 

You can run an ozone machine for a bit while no one (including pets, but assuming they have none) are in the house.

There's a real good chance that the lease requires them to do several things: upkeep on the unit is a big one (damage to property), weeds outside and landscaping (which encourage pests and insects to inhabit the property), pets authorized or not, additional tenants on the property that are not on the lease.

The pet odor.

Consider all the things that could go wrong and see if the lease addresses them: unauthorized pets or tenants, early termination, security deposit, lease violations, late rent, eviction, lawn maintenance, parking, etc.5.

I have a house in BA being rented out,  to price is a set amount and that's what they shown in disbursement to me, however I got a copy on the current leasing agreement with the tenets and found it that they are charging tenets an additional fee for the appliances I provided,  as well as the pet fee,  both of which they are keeping, and if an appliance breaks or carpets are damaged,  i have to replace them... is this legal?

If you don't allow pets and they have six dogs, you can tell them they won't qualify.I often deal with applicants that I don't think will qualify, and I tell them that.

Is it legal to charge non-refundable pet deposit and monthly pet fee in Wisconsin?

Some do not meet basic requirements like "No Pets Allowed" but I tell them I will send them an application because I am nervous.

But, parroting what others have said, your real job on a BRRRR is to get the highest appraisal possible so you can pull all your money back out.