Take large male companionship with you if you can. 

The provision of emotional support, well-being, comfort, or companionship do not constitute work or tasks, so these animals are not considered service animals.

But if he is seeking companionship or more, it may be a good idea for you to send someone else to his apt when he requests a visit, or communicate via text or better yet a message system. 

Most seniors that are living in retirement communities like it for the companionship they get.

These support animals provide companionship, relieve loneliness, and sometimes help with depression, anxiety, and certain phobias, but do not have special training to perform tasks that assist people with disabilities.

No, love, joy, companionship, trust between strangers, all around the best time I have had since I was highschool going to rave party.

Emotional Support Animals, on the other hand, can be any animal (dog, cat, lizard, bird, pig, etc) and require zero training or even purpose beyond "companionship". 

Emotional Support Animals in HousingHere is some reading material on the distinction:The Department of Justice in the 2008 proposal makes clear that animals “whose sole function is to provide emotional support, comfort, therapy, companionship, therapeutic benefits, or promote emotional well–being are not service animals.”

On the other side of the spectrum, I leased a 6 bedroom home I owned in a very marginal neighborhood to a husband and wife who rent rooms to mothers and children escaping from abusive relationships who have money but don’t want to stay at a homeless shelter but want counseling and companionship.  

this is not a service dog. its an emotion support dog. service dogs are trained to perform specific functions. emotional support dogs just exist for companionship, and while they serve medical purposes, are very often fake. you are not allowed to deny this tenant based solely on the animal, but you are allowed to ask for certain verifications. you also, only have to make "reasonable" accommodation to accomodate his "medical device" I imagine you have an argument to evict if the dog is attacking people.