A lease is a contract; it binds both parties. Neither party may unilaterally add or change terms. If the lease does not mention pets or animals, you may have them--the landlord cannot tell you to get rid of them.When the lease comes up for renewal, unless it automatically renews at the same terms, the landlord could change it to make it no pets allowed. He might also be able to elect to simply not rent to you. So after this lease is up, you may have to either get rid of the animals or look for a new place to live. But in the meantime, during the lease, if animals are not barred by the lease, you should be able to have them.