Requirement for having a dog

[Brian Hellenbrand]

So after being a landlord for two years I finally have to rent out my place as the tenant I inherited decided to purchase a house.  We have decided to allow dogs with certain restrictions.  One that is unique is we live on the other side of the duplex and have a dog, I want to put in as a requirement that we meet their dog/s with ours to make sure they get along.  I don't think there is anything illegal behind that but I just wanted to double check with the community!

Thanks!