Legal Question in Landlord & Tenant Law in Oregon

I don't know that there's a legal minimum or maximum. The tenant would need an explanation from a doctor as to why each additional service animal was necessary to treat a disability. If you're a landlord thinking about terminating someone's lease who has "too many" service or companion animals, you should talk to your own attorney. If you're a tenant thinking about getting another service or companion animal, you should talk to your doctor and landlord first.