If you own or manage rental properties, refusing to rent to someone because they have a service animal or charging them extra fees for that animal can land you in serious legal trouble. This is not about pets. Service animals are not optional amenities you can restrict with your standard no-pets policy. Federal law treats them as necessary medical equipment for people with disabilities. When you say no to a service animal, you are potentially violating the Fair Housing Act, and the tenant can sue you for civil rights violations.

The core rule is simple: a landlord must make reasonable accommodations for a tenant’s disability. Allowing a service animal is one of the most common accommodations. The animal does not have to be a dog—though dogs are most frequent—and it does not need any special certification, vest, or training paperwork. The only legal requirement is that the animal is individually trained to perform tasks that directly help the person’s disability. That can be guiding someone who is blind, alerting someone who is deaf, retrieving dropped items for a person with mobility issues, or even detecting a drop in blood sugar. Emotional support animals are different and subject to more limited rules, but service animals get the strongest protection.

If you refuse to allow a service animal, you open yourself up to a housing discrimination lawsuit under the Fair Housing Act. The tenant can file a complaint with the Department of Housing and Urban Development or take you directly to federal court. The penalties can be severe. You may be ordered to pay the tenant compensatory damages for emotional distress, punitive damages to punish your conduct, your own legal fees, and the tenant’s legal fees as well. In some cases, courts have awarded tens of thousands of dollars for a single denial.

What about legitimate concerns? You might worry about damage to the property or liability if the animal bites someone. These are not valid reasons to deny the animal outright. You can ask for proof that the animal is a service animal—specifically, you can ask whether the animal is required because of a disability and what task it has been trained to perform. You cannot ask for detailed medical records or demand that the animal demonstrate the task on the spot. If the animal causes damage beyond normal wear and tear, you can charge the tenant for those repairs, just as you would for any other damage a tenant causes. But you cannot demand a separate pet deposit or monthly pet rent for a service animal. That would be discriminatory because it treats the animal as a luxury rather than a necessary aid.

Another common mistake is invoking a no-pets clause in the lease. That clause is irrelevant when it comes to service animals. You cannot enforce a blanket ban. You must grant the accommodation unless it imposes an undue hardship on your business. What counts as an undue hardship? Very little. For example, if the tenant’s service animal is a horse and you rent a small apartment, that might be unreasonable because of space constraints. But for typical dogs and cats used as service animals, hardship rarely applies. You also cannot deny the accommodation based on allergies or fear of dogs. The law prioritizes the tenant’s right to equal access to housing over those concerns.

One real-world scenario: a landlord in California refused to allow a tenant’s service dog because the apartment had a strict no-pets policy. The tenant sued. The court ruled that the landlord had violated the Fair Housing Act and ordered over $30,000 in damages, plus attorneys’ fees. The landlord’s argument that other tenants would complain or that the dog might cause damage did not hold up because those risks are manageable through the damage deposit rules already in place.

The key takeaway: if a prospective or current tenant tells you they need a service animal, say yes. Do not ask for a pet deposit. Do not tell them to move out. Do not threaten eviction. Instead, document the request, confirm the disability and the task performed if you need to, and proceed. If you have genuine concerns about the animal’s behavior—like evidence of aggression—you can require that the animal be under control, but you cannot ban it preemptively. The burden is on you to show that the animal poses a direct threat to others, not that it might someday.

Housing discrimination based on disability is a civil rights liability that carries real financial and legal consequences. Denying a service animal is one of the easiest ways to trigger that liability. Treat these requests as mandatory accommodations, not optional favors. Your lease, your preferences, and your fears do not override federal law.