Tenant requested to allow dog after moved in

[Reyna R.]

My new (less than a month old) tenant is requesting for us to allow his dog in the unit. Until this request came up there was never any mentioning of any ownership of dog by this individual. I'm a dog owner myself so I feel conflicted.  My main issue is that it wasn't brought up earlier and the tenant has  apparently owned such dog since it was 6 weeks old. Would like to get everyone's thoughts on whether to allow a lease amendment or not.