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What state are you from, because if you want something to be done as soon as possible, you can evict him for unpaid rent as well as breaking the terms of the lease which is normally a 3 day eviction. If he does not move out in that time then you can proceed with eviction proceedings. You need to take care of this problem ASAP and get this person to leave. A verbal agreement to stay into March is not binding especially with unpaid rent and doing something you expressly told him he could not do (bringing in the vet). You should hire a local attorney experienced in landlord tenant and ascertain your rights.
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