Current Tenant Boy friend plus dog

[Steven Clark]

Hello,

I currently have a tenant that is section 8 and shes having her boyfriend stay over often. She asked me today that he might move in in the near feature and I said if your relationship gets to that point we will just need to add him to the lease.1st question how does that effect section 8? Do I need to notified them or is that something she does? 2nd He wants to have a dog move in. Its a small dog what would a reasonable charge be? 

Background this is a 3 family owner occupied