Tenants have extra family members staying

[Matt Barker]

Hey all. Starting to build my rental portfolio and my tenants came to me last week asking if their 2 family members could stay at the home for about 1 month while they transition from Vegas to STL. The current tenants are an older couple and have been nothing but great! My concern as is my tenants is that the family members have a dog that would have to stay there and it specifically said no dogs in the lease unless discussed with me. (Hardwood floors redone) Do I ask for a no refundable deposit for the month and limit it to one month? Help!

[Vance Courtney]

The bigger question you need to ask yourself and answer is, what if it's longer than 1month?  I am assuming this isn't rent free.  Where is the location of the rental property to address the concerns for a landlord friendly state?
I only ask about the state where the rental is located because of certain tenancy laws you would want to ask an attorney about.