I check the lease before I sign it. As long as pets are allowed than there should be no issue. I have 12 snakes in my apartment - there are no by-lays in toronto limiting the amount of reptiles I can have and my lease allows pets. There's nothing they can do.. HAHA. With that said the responcible thing to do is let your new landlords know about your pets and see what they say. Most buildings don't care. There are too many units for them to care what you do in yours.. The only issue I can see is if your hydro is included in the rent they may charge you extra if you have heat sources for the animals..