Automatic Litter Boxes for Maine Coons
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An automatic litter box for a Maine Coon has to give a large cat enough length, an easy way in, and a way to keep waste out of the room. The one listing we captured is the Happypaw XXXL open-top box. The listing does not name Maine Coons and does not give an interior length, so it cannot show that this box fits one. The calculation below shows the limit the listed size allows, and you can apply it with your own cat’s measurement.
Quick answer
- Who it suits: a large adult cat that will use an open-top box and can step in over a low entry. The listing calls it ideal for large cats.
- The limit: the AAFP guideline says a box should be at least 1.5 times the length of the cat’s body. With the listing’s largest dimension of 26 inches, the longest body that rule allows is about 17.3 inches. An interior is always smaller than an outer size, so the real limit is lower.
- What the listing does not state: interior length, a cat weight limit and the tray size.
- Before you decide: check the current price on Amazon.
What the listing says
| Spec | What the listing says |
|---|---|
| Product dimensions | 17 x 26 x 21 inches. The listing does not label which figure is length. |
| Weight | 23.5 pounds |
| Size | XXXL |
| Entry opening | 55 x 42 cm (about 21.7 x 16.5 inches, our conversion) |
| Waste bin | 12 L. The listing says it holds up to 3 weeks of waste (seller claim). |
| Body material | Stainless steel, per a bullet about odor. The full materials are not stated. |
| Entry | Low-entry threshold (listing claim) |
| Safety | Infrared sensor and anti-pinch design. The listing says auto-clean is for cats 6 months or older and 15 cm or taller, and otherwise to keep auto-clean off. |
| Connectivity | 2.4GHz Wi-Fi app control |
| Included | Litter box, liner, adapter, manual and 2 odor removers |
| Warranty | 3 years (listing) |
| Litter | Works with most clumping litters. Mineral and bentonite are recommended. |
View on Amazon (affiliate link)
The calculation that matters
The AAFP guideline text we opened says cats prefer litter boxes at least 1.5 times the length of their bodies, and that many commercial boxes are too small for larger cats. That gives a formula:
Longest body the box allows = box length / 1.5
Using 26 inches as the box length gives 26 / 1.5 = 17.3 inches. The listing does not say which dimension is length, and an interior is smaller than the outer size, so treat 17.3 inches as a ceiling. If the interior is shorter, the limit falls with it.
The table below turns the rule around. Find your cat’s body length in the left column to see the shortest box the rule allows for that cat.
| Cat body length (inches) | Shortest box length the rule allows (inches) |
|---|---|
| 16 | 24 |
| 18 | 27 |
| 20 | 30 |
| 22 | 33 |
| 24 | 36 |
Each figure is the body length multiplied by 1.5. The listing’s largest outer dimension is 26 inches, so on the outer figure alone the rule is met only up to a body length of about 17 inches. The interior length, which the listing does not give, decides the real figure.
The guideline text we opened does not define how to measure body length. Measure your cat the same way each time, and compare the result with the interior length the seller gives, if they give one.
Why an open top and a low entry still matter
Cornell’s house soiling guidance says most cats prefer an uncovered box that lets odors escape and gives a 360-degree view. The same page says covers hold odors in from a cat’s point of view, and that kittens and elderly cats need boxes with low sides. This listing is open-top and describes a low entry, which fits those points. The Cornell points we use here are about cover, view and entry, not length, so the length check above still applies.
Pros and cons, as the listing states them
- Pros (the listing says): an open top; a low-entry design; a 12 L waste bin; a stainless steel body; an anti-pinch sensor; a 3-year warranty; a size label of XXXL.
- Cons (the listing says, or does not say): no interior length; no cat weight limit; 23.5 pounds makes it heavy to move; auto-clean is limited to cats 6 months or older and 15 cm or taller; remote control needs the app and Wi-Fi.
Who should skip it
- A cat whose body is longer than about 17 inches by your measurement. The listed outer size does not show the box meets the 1.5 times rule for that cat.
- A cat under 6 months old, or under 15 cm tall. The listing says to keep auto-clean off for those cats.
- A household that wants no app or Wi-Fi.
- A home that needs a covered box. Cornell says covers hold odors in from the cat’s point of view.
Buying checklist
- Measure your cat’s body the same way each time, and compare it with 1.5 times the box length.
- Ask the seller for the interior length and the tray size. The listing gives neither.
- Compare the entry opening, 55 x 42 cm, with your cat’s size. The listing does not give an entry height.
- Check the auto-clean rule against your cat’s age and height.
- Ask the seller what the two odor removers contain. The listing does not say.
- Ask a vet about any change in your cat’s litter box habits. The listing mentions health alerts, and this post makes no health claims.
- Look up the current price on Amazon.
How we chose
We ran one Amazon search for the keyword and opened one listing from the results: the Happypaw XXXL open-top box. The other results were automatic boxes we did not open, so this post does not rank them. The listing was chosen because its title and bullets point to large cats and an open top.
What we could not verify
- Interior length, litter depth, tray size and any cat weight limit.
- Whether the box fits a Maine Coon or any other breed. The listing names no breed.
- The seller’s claim that the bin holds 3 weeks of waste.
- The seller’s claims about stainless steel and odor, and what the odor removers contain.
- The brand. The page names the store as Sousia and the brand as Happypaw, so confirm the brand before you buy.
- The health alerts the app is said to give. This post does not check them.
FAQ
Does this box fit a Maine Coon?
The listing does not say. It gives an outer size and calls the box ideal for large cats, but it names no breed and no interior length. Use the 1.5 times rule with your own cat’s measured body length.
What is the 1.5 times rule?
The AAFP guideline we opened says cats prefer litter boxes at least 1.5 times the length of their bodies. For a box length of 26 inches, the longest body the rule allows is about 17.3 inches.
Is an open top better than a covered box?
Cornell’s guidance says most cats prefer an uncovered box. Its page also notes that people like covered boxes for odor and stray litter, so you will need to weigh your own needs against your cat’s preference.
How deep should the litter be?
ASPCA’s litter box problems page says cats usually prefer one to two inches of litter, and that litter that is too deep can lead a cat to avoid the box.
When should I ask a vet?
If your cat changes its litter box habits, ask your vet. This post does not give health advice.
Bottom line
A large cat needs a box long enough for its body. Measure your cat, ask the seller for the interior length, and apply the 1.5 times rule. If the seller cannot give an interior length, do not buy on the outer size alone.
For related reading, see our guide to self-cleaning cat litter boxes.
Sources
- Cornell Feline Health Center, Feline Behavior Problems: House Soiling. https://www.vet.cornell.edu/departments-centers-and-institutes/cornell-feline-health-center/health-information/feline-health-topics/feline-behavior-problems-house-soiling (opened and checked 2026-10-19). Used for: most cats prefer an uncovered box with a 360-degree view; covers hold odors in from the cat’s point of view; kittens and elderly cats need low sides.
- ASPCA, Litter Box Problems. https://www.aspca.org/pet-care/cat-care/common-cat-behavior-issues/litter-box-problems (opened and checked 2026-10-19). Used for: the majority of cats prefer large boxes they can enter easily; cats usually prefer one to two inches of litter.
- American Association of Feline Practitioners, Feline Behavior Guidelines, litter box section (PDF hosted by catvets.com). https://catvets.com/wp-content/uploads/2024/01/FelineBehaviorGLS.pdf (opened 2026-10-19; the text carries a 2004 copyright line). Used for: cats prefer boxes at least 1.5 times the length of their bodies; many commercial boxes are too small for larger cats.
- Product data: Amazon listing for ASIN B0H86W4S94, captured 2026-10-19. Specs are as the seller states them and were not measured.
