We own a house that we rent out to a family that owns a dog. Our house has a pool. We have a property manager that takes care of the rent and hold the contract etc., but my dad who lives nearby (they do not know he is related to us) takes care of cutting the grass and pool maintainance. He just brought to my attention that he has had to clean the pool filter much more than necessary as it is clogged with hair. He believes they are letting the dog swim in the pool. I have never had a pool before and my dogs would not swim in one. My understanding is that the dog hair will burn the pool filter out. Anyone let their dog swim in their pool? Any suggestions? What would you do if you found out your tenants were allowing their dog in the pool?