Does a nursing home, AL, MC resident have to share a room with someone who has a pet? Are there facilities that prohibit pets?

ALs u usually have a room to yourself. The MC near me u have ur own room, not sure about others. But once on Medicaid, the residents may have to share rooms. In ALs, you must be able to care for the pet to have it. LTC/NHs don't allow pets.

I would say if u come across this situation, that you can ask that a family member not be put in a room where there is no pet.

https://www.agingcare.com/questions/moms-started-to-spank-her-cat-recently-at-the-memory-care-facility-453004.htm

Here's a thread where a MC resident started spanking her cat. It might have been coincidental with getting a new roommate.

I would not want to have a roommate with a pet, nor would I want any of my loved ones to have a roommate with a pet. If people are in such facilities, they need help taking care of themselves, much less a pet. We read on this forum about so many elders who aren't taking proper care of their animals.

If it was a private room, then perhaps.

I've seen NHs that have therapy pets that are pretty much around all of the time.

If there is a problem... would request that there be no pets due to allergies or sensitivity. Either on the part of the resident or a family member.
And I would think it would matter who was in the room first. If I (or my loved one)were moved into a room where there was already a pet I would ask to be moved to another room. If I (or loved one) were already in the room and someone was going to move in I would ask them to be placed in another room. That might not be possible if they are short on beds or there is a specific reason for a particular room but request a transfer as soon as possible.
I am sure there are facilities that prohibit pets but they can be a very important part of therapies.
And..what type of pet are we talking about.
Bird...no way due to airborne contaminates.
Cat..not bad but who is cleaning the litter box and how often?
Dog..What type and who is walking the dog and how often and who is cleaning up after it if it is using pads or litter box?
Also ..is this a pet of a resident or a "facility" pet? Often facilities will have a "house dog or cat" that is free to wander the facility and all care is done by staff assigned to care for the animal. Many places have bird displays where there are no airborne contaminates and the birds are contained within a glassed case.

I think that facilities vary, but you could plead "allergies". I think that would work. I myself am so thankful that many allow pets; they are often a great comfort to elders and others in the facilities.