回复：我的房客违反合同，现在房子里多住了两条狗（合同里是两条，现在有四条），PM email我要不要在合同到期时赶走他，大家给些

You don't have to renew with him: but I'd raise the question before lease term ends and maybe he'll rectify the situation.  You can even initiate an eviction process for breach of lease agreement ANYTIME.