Tenant refuses to remove dog - quick help please!

[Sandy Spence]

We are planning to show our rental unit to an applicant soon and our tenant is saying "no. You can show it after we move." We replied that as it states in our lease terms we can enter the property with 24 hours notice for any reason. The tenant said "fine, we arent removing the dog or straightening up." I replied that if they refused to clean, that is a reflection on them. The dog is non-negotiable. The dog is friendly when they are around but when we entered the house without them in the past he snarled and showed teeth. How do I handle this situation? They are moving a two weeks and this would be a second showing for thus applicant. we even tried to be courteous by asking the tenant what day/time would work best for them.