I currently have lodgers in a 3 bedroom semi. They seem nice enough and the neighbours say they are well behaved. However their contract says no pets and I found out they have 2 cats living in the property. I was visiting a friend and saw a cat sitting on the window ( inside) as I passed. They contacted me a couple of months back to ask if I was likely to renew contract and I said yes - subject to a house inspection. They have also mounted a 60 inch tv on the living room wall without permission. I have a strict no pets no smoking clause on the tenancy agreement. I have a cat allergy. Contract needs renewed in a month. Aibu not to renew?