What defines a companion pet? Sounds like just one animal to me. Some dog, bird or cat to take the place of a human. I see an elderly person living in an apartment alone. The landlord says "no pets" . Having this pet for this person is all they have. It replaces a person. So why not make an exception here? The family with 4 kids and 2 dogs does not fit very well in an apartment. The lone person with a pet as a companion is what the bill is about(I think?) but maybe I don't see everything? Is the huge family trying to make a loophole here so they can have 4 kids and several dogs in their apartment, wailing "that old lady there has a cat, why can't we have all our dogs too?" You cannot please everyone, but someone living alone should be allowed to have companion pet.
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Now, in my opinion, THAT is discrimination. I do not think you can say that if Mary lives alone that she needs and loves her cat more than Mary and Sue love and need their cat, because Mary and Sue are roommates and live in the same apartment.

I don't have a problem with an apartment complex saying, "No pets, period." If you don't like it, don't rent there. I also don't have a problem with an apartment complex saying, "Only one pet per apartment." But I DO have a problem with them saying, "If you live alone, you can have a pet. But if more than one person lives there, no pets." That is NOT fair, IMO.