A dog is $25 - $100 per month, depending on some risk factors like size and breed.

You can require insurance and an extra deposit as well as impose breed restrictions.

Of course if you ask for a concession and they say no, then you're back to the original question above of how good a deal you're getting in the first place.Depending on the breed of dog, you may have to get a different, more expensive insurance policy like RI Fair Plan (could be +1000 or 1500 per year), at least until you get the tenant with the dog out, when you can try to switch back to a more standard/less expensive policy.

Also, almost no permits are needed where we are building and it seems to breed a lax attitude with many contractors and builders we spoke with.

My understanding is you cannot be forced to lease to someone with an ESA or Service Animal if their animal is deemed a dangerous breed by your insurance.

My insurance has breed restrictions so I do to but it is a good income stream.  

We don't have any restrictions on type or breed but I've learned over the years that if a pet owner can't afford the pet fees or complains about it they aren't really taking care of their pets well or paying their bills.

For some additional context, we are looking for a dog-friendly (not breed restricted) 3/2 (or larger) with at least 1800 sq ft in a Nashville suburb.

And as we all know- success breeds the drive and desire to find more properties and opportunities.

Our insurance company encouraged us to restrict the top 10 most dangerous breeds.