Make sure to consult an attorney for any alterations outside of standard documentation. 

., if it would impose an undue financial and administrative burden on the housing provider or it would fundamentally alter the nature of the provider's operations.

btw:  Painting one interior room can cost $400, if he did the whole exterior it will be much higher.My lease clearly states, "Leasee is not allowed to make any improvements or alterations without explicit written approval" and during the  move-in walk through, I read and have him/her initial every paragraph.I also second the motion that tenants should never be allowed if only due to the suspect quality.

For Both Cats and Dogs:- Require alteration of animals and ask for a copy of certificates.

Even if the tenant is not a friend/coworker, etc you are giving them permission to alter a property without knowing what their skills are.  

If service/companion animals alters your way of business. 2.

Well, I hope your lease with the salon is a commercial lease and a good one at that - commercial tenants in PA do not have all of the same rights as a residential tenant, but if the lease gives them those rights ...A typical lease will have language to the effect that alterations (painting exterior) must be approved, and if approved must be restored to prior condition.

Usually due to a life altering issue.

I am not going to replace a completely functioning fan for a small tick that does not alter the way it works. 

You can definitely require proof of current vaccinations, alteration and a behavioral report from the doggy daycare.