Let's try again.
Does it actually SAY they are durable medical equipment or are you concluding that because you can deduct them LIKE (not as, but like) equipment? You can deduct dependants too. (note: tax laws are different from housing laws, just like the ADA is different from the FHAA which is different from the ACAA, so even if you could prove the were machines for tax purposes, that means nothing when it comes to pets in housing--they are not parallel laws).
You guys are reaching. Most likely it is a knee-jerk reaction to the statement there is some overlap between a service dog and a pet dog. They are dogs. Hands up, everyone who treats their dog like durable medical equipment any part of the time. Now hands up those who treat them like beloved pets when off duty. Now fess up. Anyone else whisper "I love you" to your service dog when he gives you a sly muppet grin while on duty?
So tossing the whole service dogs are not pets argument out the window...
What do we REALLY have?
Landlord says you can have one pet dog. Possible scenarios:
1. You get a service dog, or already have a service dog
2. You have a pet dog, then ask for an accommodation to add a SD
3. You have a service dog, then want to add an additional dog as a pet
Scenarios 1and 2 aren't the trouble spots.
So why is it really an issue whether that service dog counts in the pets slot?
Possibilities:
1. It demeans the service dog by putting it in the same category with pets
2. It means you get treated less favorably than everyone who is not disabled
3. It's a perk or loophole you deserve for being disabled
It does not demean the service dog. There is nothing wrong with pet dogs. Remember that the actual rights belong to the disabled human and that the FHAA treats pets for the mentally disabled the same as service dogs for the disabled. Parading a pet in places where pets are not permitted by buying a vest and ID off the Internet, regardless of how horribly the beast behaves, or how it affects the way people view legit teams--that demeans service dogs.
It does not mean you get treated less favorably than others. They get their pets and you get your service dog. Your service dog does all that a pet does and more. That puts you ahead of the game.
This isn't a "plus one" situation where you automatically get one more than everyone else because you are disabled. This is not a situation that nullifies the reasonableness test. Are there some instances when it is reasonable to have a pet in addition to a service dog? Sure, I listed some. Is it inherently reasonable to have a pet in addition to a service dog? No. Reasonableness means considering the needs of all involved, not just granting one special group privileges because they are special.
What if the pet limit is based on the ecological impact of the animals? Two dogs means twice as much urine output, and feces. It means twice as much wear and tear on carpeting and landscaping. It may affect the landlord's insurance. It almost certainly will cause difficulties for him if you get two dogs and everyone else gets just one. There are instances when having both a pet and a SD might be unreasonable. Which is precisely why having a service dog is not an automatic, guaranteed, absolute right, no matter what, but a REASONABLE ACCOMMODATION.
Can you ask for a pet in addition to a SD? Sure. Are the housing police going to swoop down and defend your right to add a pet to the equation? No, of course not. Whether you have a pet is up to the landlord. He can allow them or not. He can allow them for some tenants and not others. Denying an ordinary pet is not discrimination; denying a service dog (or ESA) is.
Just understand that you are making a request ("request for reasonable accommodation"), which you can support with persuasive arguments (such as "Rufus shouldn't count because he's a service dog"). But those arguments aren't the same as laws. The landlord must obey laws or risk the consequences. He doesn't have to concede persuasive arguments. You get more flies with honey. If you really want to succeed you ask nicely and persuasively, not demanding or assuming. Assume and you may find yourself evicted. Bully the landlord into something and you've made a bad enemy because he can make your life a living hell.
I have some real issues about entitlement. Discrimination laws are meant to level the playing field, not skew it in favor of one group. There's a reason why affirmative action was such a disaster. Democracy likes equality. It abhors elitism.