Pets generate more HOA complaints than almost anything except parking. Barking, waste, a dog that is clearly over the weight limit, a fourth cat in a two-pet community. Boards field these constantly.
Most pet rules are enforceable. Then an owner submits a request involving an assistance animal, and the board is suddenly in federal fair housing territory, where the ordinary rules do not apply and the penalties for getting it wrong are real.
Here is the line, as clearly as we can draw it.
What boards can generally restrict
Pet rules that live in the CC&Rs, or in board rules the CC&Rs authorize, are usually enforceable against ordinary pets. Common ones that hold up:
Number limits. Two pets per unit is a standard and defensible rule.
Weight and size limits. Common in condominiums and attached housing, less common in detached communities.
Breed restrictions. Legal in most places, though a handful of states and cities restrict breed-specific rules and some insurers push in the opposite direction. Check locally before you write one.
Leash and common-area rules. Nearly universal and rarely challenged.
Waste rules. The most-complained-about issue in most communities, and completely enforceable.
Registration. Requiring owners to register pets with the association is reasonable and makes enforcement possible.
Nuisance rules. Persistent barking, aggression, damage. Enforceable, but you need documentation, not one neighbor's account.
The authority for all of it traces back to the recorded document. If the CC&Rs do not authorize a pet rule, the board cannot invent one, and buyers take the property subject to whatever limits the CC&Rs already contain.

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Where the pet rule stops working
The Fair Housing Act prohibits housing discrimination on the basis of race, color, national origin, religion, sex, familial status, and disability. HUD's overview of housing discrimination under the Fair Housing Act covers the protected categories and the complaint process; the Department of Justice's Fair Housing Act page explains that DOJ and HUD share enforcement, and that DOJ can bring pattern-or-practice cases carrying injunctive relief, damages, and civil penalties.
Two of those protected categories reach pet policy directly.
Disability. Where a resident with a disability needs an animal in order to have equal use and enjoyment of their home, that animal is not a pet in the eyes of the law. It is an accommodation. A pet rule that would otherwise apply, a breed ban, a weight limit, a pet count, a pet fee, generally has to give way. The board's role is not to decide whether the person is disabled enough. It is to consider the request.
Familial status. A pet rule is unlikely to hit this one, but rules aimed at children, and there are more of them in HOA rulebooks than you would think, often do. If your rules restrict who may use the pool by age in a way that goes beyond genuine safety, that is worth a hard look this week.
How a board should actually handle an assistance animal request
The instinct to interrogate is the instinct to avoid. A defensible process looks like this:
Have a written accommodation request process. One form, one place to send it, one named person who receives it.
Respond in writing, promptly. Silence reads as denial and denial is what gets litigated.
Ask only what you are entitled to ask. Where the disability is not obvious, an association may generally seek confirmation that the person has a disability-related need for the animal. It may not demand medical records, a diagnosis, or a detailed history.
Do not charge pet fees or deposits for an assistance animal. This one catches boards constantly.
Document everything, and do not discuss it publicly. The request, the response, the decision, and the reasoning belong in the file, not in the open portion of a meeting.
Get counsel involved before you deny. If the board is leaning toward no, that is the moment to stop and call the association's attorney. Nothing in this article is legal advice, and fair housing is not an area to improvise in.

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The enforcement problem underneath all of this
Most pet disputes are not really about the pet. They are about the fact that one dog got a notice and another one did not.
If your community has a two-pet limit and eleven households are over it, sending a notice to the one owner who annoyed a board member is the fastest way to lose the case. Uneven enforcement gives the owner a defense and the board a reputation problem, which is exactly the trap we cover in selective enforcement.
The fix is unglamorous. Register every pet. Log every complaint with a date and a description. Send the same notice, in the same sequence, to every owner in the same situation. Review the whole list before you act on one of them.
For the underlying authority, start with CC&Rs explained. For the notice mechanics, HOA violation notices covers what a notice needs to contain to hold up.
The short version
Count limits, weight limits, leash rules, and waste rules are enforceable. Assistance animals sit outside your pet policy and are governed by federal law. Build a written accommodation process, respond in writing, ask only what you may ask, and call counsel before you deny.
And enforce whatever rule you keep the same way for everyone. That single habit prevents most of the fights.
HOA-OS logs every pet registration, complaint, and notice in one place, so the board can see the whole pattern before it acts on any one of them. See pricing.
