A companion to Pet Deposit vs. Pet Fee vs. Pet Rent, Pet Damage in a Rental, and What to Include in a Lease Agreement. The addendum is where you decide, before anything goes wrong, who pays when the dog chews the trim.
A tenant’s dog chews through the bottom of the door trim and scratches the back of two interior doors. At move-out you deduct $700 for the repair, and the tenant fires back: “You always knew I had a dog. You never said anything.” There is nothing in the lease about the dog, no pet deposit, and no signed rules. You end up giving most of that $700 back.
That is the whole argument for a pet addendum. A pet addendum is a short, signed attachment to the lease that turns “yeah, a dog is fine” said over the phone into an enforceable set of rules and a defensible basis for charging pet damage. This guide covers every clause a rental pet agreement should contain, how a pet deposit differs from a pet fee and pet rent, why service animals and emotional support animals never go on it, and the one piece of documentation that decides whether your pet damage deduction actually survives a dispute.
This is general information, not legal advice for your state. Pet deposit limits, nonrefundable fee rules, and assistance-animal law vary by state and locality, so confirm your local rules or have a local attorney review your lease and addendum before you rely on any of this.
What is a pet addendum, and why does it matter?
A pet addendum is an attachment to the lease that grants permission for a specific animal and sets the terms that come with it. It is signed by the same people who signed the lease, it references the lease, and once signed it is part of the lease. If the base lease says “no pets” and you add an addendum allowing one, the addendum controls.
The reason it matters is evidentiary, not ceremonial. A lease that is silent on pets, or a verbal “a dog is fine,” leaves you with two problems when something goes wrong:
- You cannot cleanly enforce rules you never wrote down. Noise, waste in the yard, an unneutered animal, a second pet that appeared later. If it is not in writing, you are arguing about what you both remember.
- You weaken your claim to pet damage. When the tenant says you knew about and accepted the animal with no conditions, a silent lease helps them, not you.
The addendum fixes the first problem completely and the second problem only partway. It makes the tenant responsible for pet damage in writing. What it cannot do by itself is prove the damage was not already there. That is a documentation job, and it is the part most landlords skip. We will come back to it, because it is where pet deductions are actually won and lost.
Pet deposit vs. pet fee vs. pet rent
The money terms are where a pet addendum does its most practical work, and they are not interchangeable. Each behaves differently, and some are restricted by state law. The deeper breakdown lives in Pet Deposit vs. Pet Fee vs. Pet Rent, but here is the short version you need to write the addendum correctly.
| Term | Refundable? | When paid | What it is for |
|---|---|---|---|
| Pet deposit | Yes, like the security deposit | Once, up front | Covers pet damage beyond normal wear; returned if there is none |
| Pet fee | No, nonrefundable | Once, up front | A flat charge for the privilege of keeping a pet; not tied to damage |
| Pet rent | No, it is rent | Monthly, with rent | Ongoing charge that reflects added wear and risk over time |
Three rules keep you out of trouble here. First, in some states a pet deposit counts against your overall security deposit cap, so a large pet deposit on top of a full security deposit can push you over the legal limit. Second, some states restrict or prohibit nonrefundable fees entirely, which turns a “pet fee” into a refundable deposit whether you meant it to be or not. Third, keep the pet deposit separate and clearly labeled from the regular security deposit in the addendum, because mixing them makes the itemized return at move-out harder to defend. Pick the structure your state allows, name the exact dollar amount, and say plainly in the addendum whether each amount is refundable.
What to include in a pet addendum
A good rental pet agreement is specific. “Tenant may have a pet” is not an addendum, it is a shrug. Name the actual animal, set the money, and spell out the responsibilities. Here is the clause checklist.
Identify the exact animal
Permission should run to a specific pet, not pets in general. Record the species and breed, name, adult weight, color and markings, age, and spay or neuter status, and attach a photo. This matters for two reasons: it stops a 15-pound dog from quietly becoming a 70-pound dog, and it stops the one approved cat from turning into three. The addendum should state in plain language that the permission is for this animal only and that any additional or replacement pet requires a new written approval.
State the money precisely
Name the pet deposit, the one-time pet fee, and the monthly pet rent as exact dollar amounts, and say which are refundable. If you are only using one of the three, say so and leave the others at zero. Confirm the pet deposit sits within your state’s deposit cap and is held and returned the same way as the security deposit.
Assign responsibility and set the rules
This is the enforcement half. Make the tenant responsible for all damage caused by the animal, including damage beyond normal wear, and for any pest treatment (fleas, for example) the pet necessitates. Add the house rules that fit your property: leashing in common areas, picking up waste in the yard, litter disposal, noise and nuisance limits, and where the animal may and may not be. Close with a removal clause stating that repeated violations, or a dangerous animal, can require the pet’s removal, which is enforced through your normal lease violation process, not a lockout.
Service animals and ESAs are not pets
This is the clause that gets landlords sued, so it gets its own section. Under the federal Fair Housing Act, service animals and emotional support animals are not pets, and a pet addendum does not apply to them. That has hard consequences:
- You cannot charge a pet deposit, pet fee, or pet rent for an assistance animal.
- You cannot apply breed, weight, or size limits to it.
- You cannot refuse a reasonable accommodation request for one, even in a “no pets” building, absent a narrow exception (a direct threat to others or undue hardship).
What you can still do is hold the tenant responsible for actual damage the animal causes, the same as any tenant, and request reasonable documentation of the disability-related need when it is not obvious. The mistake to avoid is treating an assistance animal like a pet by sticking it on the pet addendum and charging for it. Handle accommodation requests on their own track. For the full playbook, see Emotional Support Animals: A Landlord’s Guide. When in doubt about a specific request, confirm your obligations under the FHA and any stricter state law before you say no.
How a pet addendum actually protects your deposit
Here is the part that decides real money, and it is the part the addendum cannot do alone.
Your pet addendum says the tenant is responsible for pet damage. Good. Now the dog chews the door trim, scratches the hardwood near the back door, and stains the carpet in one bedroom. You get a $900 repair estimate and plan to deduct it. The tenant responds with four words that defeat a lot of deductions: “It was already like that.”
Now the burden is effectively on you. The addendum established responsibility, but it said nothing about the condition of that trim, that floor, and that carpet on the day the tenant moved in. If you cannot prove those surfaces were intact before the animal arrived, you are trying to prove a negative, and in a deposit dispute or small claims hearing the tenant with a plausible story often wins the tie. For the broader version of this fight, see How to Prove Tenant Damage and Pet Damage in a Rental.
So the addendum and a dated move-in condition record are a pair. One establishes that the tenant owes for pet damage; the other proves what “damage” even means by fixing the baseline. Run them together and a chewed-trim deduction is a documented before-and-after. Run the addendum alone and you have half a case.
This pairing is exactly what the DiscoveryMark move-in flow produces. The tenant completes a structured walkthrough through a passwordless link, no app and no account, adding timestamped photos and notes room by room, and signs off on the condition. The pet addendum and the pet's photo ride along in the same record. The result is one finalized, court-ready PDF that shows the trim, the floors, and the carpet were intact on day one, with the signed pet terms attached. When a pet damage deduction is challenged later, you export one file instead of reconstructing the story from a phone full of undated photos.
Here is what that tenant-completed move-in walkthrough looks like, the same flow a renter sees when they document the unit’s condition before moving the pet in.
When a tenant gets a pet without permission
A pet addendum also defines the violation when a tenant brings in an animal you never approved. If the lease and addendum are clear that pets require written permission, an unapproved dog or cat is a straightforward lease violation, not a gray area.
Handle it the way you would any violation: document it with dated photos or a neighbor’s written complaint, then send a written notice to cure citing the specific clause. The cure is usually one of two things: the tenant removes the animal, or the tenant applies to add it to the lease on a signed pet addendum with the appropriate deposit or pet rent. Many unauthorized-pet situations resolve by simply papering the pet properly after the fact. The full escalation path, including what to do when the tenant refuses both options, is in Unauthorized Pet in a Rental. What you do not do is change the locks or shut anything off, which is an illegal self-help eviction in nearly every state.
Pet addendum mistakes that cost landlords
A short list of the ways a pet addendum fails to do its job:
- No move-in record. The addendum assigns responsibility; the move-in record proves the condition. Without the second half, “it was already like that” beats your deduction.
- A vague animal. “A dog” lets a small dog become a big one and one pet become three. Name the specific animal and require written approval for any change.
- Mislabeled money. Calling a charge a nonrefundable “pet fee” in a state that bans nonrefundable fees, or stacking a pet deposit that pushes you over the state deposit cap, creates its own liability.
- Treating an assistance animal as a pet. Charging a pet deposit or pet rent for a service animal or ESA, or applying breed and weight limits to one, is a fair housing problem, not a lease matter.
- Never updating it. The tenant gets a second pet two years in and nobody signs anything. The new animal is now undocumented, and so is the condition before it arrived.
Frequently asked questions
Do I legally need a pet addendum to allow a pet? No law requires the document, but without it you have no written pet rules and a much weaker claim to pet damage. You can allow a pet with a verbal yes, but you will regret it the first time an animal causes real damage and the tenant says you accepted the pet with no conditions. The addendum is cheap insurance.
Can I charge both a pet deposit and monthly pet rent? In most states, yes, as long as the total deposit stays within your state’s security deposit cap and your pet rent is reasonable. A pet deposit is refundable and covers damage; pet rent is nonrefundable ongoing income. Confirm your state’s deposit cap before stacking a large pet deposit on top of a full security deposit. See Pet Deposit vs. Pet Fee vs. Pet Rent for the details.
Can I charge a pet deposit for a service animal or ESA? No. Service animals and emotional support animals are not pets under the federal Fair Housing Act, so you cannot charge a pet deposit, pet fee, or pet rent for them, and you cannot apply breed or weight restrictions. You can still hold the tenant responsible for any actual damage the animal causes, the same as any tenant.
What if the tenant’s pet damages the unit beyond the pet deposit? The pet deposit is a floor, not a ceiling. If documented pet damage exceeds the pet deposit and the security deposit combined, you can bill the tenant for the balance and pursue it in small claims if they do not pay. This only works if you can prove the damage with a move-in baseline and dated move-out photos. See Pet Damage in a Rental.
My tenant got a dog without asking. Can I make them get rid of it? If your lease requires written permission for pets, an unapproved animal is a lease violation. Document it and send a notice to cure that gives the tenant a choice: remove the animal or apply to add it on a signed pet addendum with the proper deposit. Do not change locks or use any self-help removal. The step-by-step is in Unauthorized Pet in a Rental.
The bottom line
A pet addendum is how you stop being surprised by the dog you already knew about. It names the specific animal, sets the pet deposit, fee, or pet rent within your state’s limits, and makes the tenant responsible in writing for damage, waste, and noise. Keep service animals and emotional support animals off it entirely, because they are not pets under fair housing law.
The addendum does half the job on its own. The other half is the dated move-in record that proves the unit’s condition before the animal arrived, because that is what turns “it was already like that” from a winning defense into a losing one. Sign the addendum, document the baseline, and a pet damage deduction becomes a before-and-after you can hand to anyone. This is general information, not legal advice for your state, so confirm your local pet deposit, nonrefundable fee, and assistance-animal rules, or have a local attorney review your lease and addendum, before you rely on it.
