I don't really think it's because they don't like them, landlords have just had to do so many repairs and fixes from them. So many of the rental ads say No Pets and they really mean it! Being a landlord of 4 apts. I can tell you some tenants are way better than others, we've had to replace blinds, curtains, window seals and carpets. The reason I don't do cats is because of the allergies when they move I go clean. Can't rent 1 to the brat, mine are all full but I'm looking very hard to try to find one.