I used to rent a nice townhouse that allowed pets, but waited till I bought my own house to get my boxer. Landlords do change their mind and may change the terms of your rental agreement to suddenly not allowing any pets/dogs.
I suggest to wait, if at all possible, till you get your own condo/house to get your new best friend. You don't ever want to be in the situation that you are forced to move or rehome your best friend. better prevent it than deal with it.