Tenant asked to add a dog to the house hold

[Michael P.]

Hi all,

My long term tenant has asked what I thought about adding a dog to the household.  My lease agreement states no pets, certainly I can add an addendum.  What are landlords requesting from the tenant if they approve adding a pet, is it higher rent, is a non refundable fee, is it a deposit of some sort.  Side note, good tenants, good be very long term tenants so I want to make them happy.  Property is in NJ.

Thoughts?