Overview
The Litter-Robot 4 is Whisker’s flagship self-cleaning litter box and the model most rivals get measured against. It is an enclosed globe: after your cat leaves, the globe turns slowly, sifts clumps through a screen and drops them into a drawer in the base. Whisker rates it for cats from 3 to 25 lb, the widest range among the enclosed boxes in our self cleaning litter box guide.
One thing to know before you click through: the Amazon listing is not identical in both countries. On Amazon.com, ASIN B0BH6MD3DJ is the robot on its own. On Amazon.ca, the same ASIN is sold as a bundle with the step and fence accessories, so compare the included items rather than just the headline.
Key features
- Rated for cats 3–25 lb (1.4–11.3 kg); Whisker says kittens under 3 lb should use semi-automatic mode only
- Laser curtain detection plus a SmartScale weight sensor that logs visits and each cat’s weight
- LitterLevel sensing reports litter bed and waste drawer levels in the app
- Footprint 22 x 27 in, 29.5 in tall, with a 15.75 x 15.75 in entry; about 24 lb empty
- Clumping clay litter only; white or translucent litters can confuse the sensors
- 2.4 GHz Wi-Fi and the Whisker app; the free tier keeps 7 days of visit and weight history
- Waste drawer needs emptying roughly every 8 days for one cat, per Whisker
Who it suits (and who should skip it)
It makes the most sense in homes with two or more cats, or with one big cat that feels cramped in smaller globes. The weight log is genuinely useful when you share a box between cats, because it shows who is visiting and how often. Owners who want a long track record, a direct Canadian store and established warranty support will also find it the easiest choice to justify.
Skip it if floor space is tight, since it stands nearly two and a half feet tall. It is also a poor match if you use pellet, paper or non-clumping litter, or if your kitten will be under 3 lb for months yet. Cats that refuse hooded boxes may never accept a globe; if a switch leads to accidents, our guide to removing pet stains naturally will help.
Costs to know about
The robot runs without a subscription. The free app covers status alerts and a week of history, while Whisker+ is an optional paid upgrade for longer trends and daily recaps. The real ongoing spend is consumables: drawer liners, carbon filters and OdorTrap packs (Whisker suggests replacing filters and packs every 2 to 4 weeks), plus clumping clay litter. Whisker includes a 1-year WhiskerCare warranty and sells extended coverage separately; its 90-day in-home trial is advertised on Whisker’s own store, so check whether it applies to an Amazon order.
How it compares
Next to the Litter-Robot EVO, the LR4 adds the laser curtain, litter-level sensing and a higher 25 lb ceiling. The EVO is shorter, lighter and cheaper, and is plenty for one or two average-size cats. If your cat avoids enclosed boxes altogether, the open-top Neakasa M1 Plus Lite accepts cats up to 33 lb and uses ordinary bags instead of branded liners.
Pros and cons
What we like
- Widest weight range of the enclosed picks: 3 to 25 lb
- Laser curtain plus weight scale gives layered cat detection
- Per-cat visit and weight logs help in multi-cat homes
- Direct Canadian store and Canadian retail support
Watch out for
- Tall, large footprint at 29.5 in high
- Clumping clay only; white litters can confuse sensors
- Longer health trends sit behind the paid Whisker+ plan
Our rating: 4.4/5
| Build quality | 4.7 |
|---|---|
| Ease of use | 4.3 |
| Safety & trust | 4.7 |
| Value | 3.7 |
| US & Canada availability | 4.6 |
Our rating is an editorial score based on the brand's published specs, independent reviews, safety and trust signals, value and availability in the US and Canada. It is not Amazon's customer rating, and brands do not pay for placement.
Frequently asked questions
Can a kitten use the Litter-Robot 4?
Only in semi-automatic mode until the kitten weighs at least 3 lb, according to Whisker. Below that weight the sensors may not detect the kitten reliably, so the automatic cycle should stay off. Once your kitten passes 3 lb you can switch to automatic mode, ideally watching the first few cycles so your kitten gets used to the sound and movement.
What is different about the Amazon.ca Litter-Robot 4 listing?
The ASIN we link, B0BH6MD3DJ, is the Step & Fence bundle on Amazon.ca and the robot only on Amazon.com. The Canadian version therefore includes the step and fence accessories. Read the included-items section on each listing before comparing them, because the two are not like-for-like.
Does the Litter-Robot 4 need a subscription?
No. The robot cleans, sends alerts and shows seven days of visit and weight history on the free Whisker app. Whisker+ is an optional paid plan that adds longer trend history and daily recaps. Ongoing costs are mainly liners, carbon filters, OdorTrap packs and clumping clay litter.
How often do you empty the Litter-Robot 4?
Whisker says roughly every eight days for one cat. With two or more cats, or a large cat, expect to empty it more often. The app's drawer level reading tells you when it is getting full, so you are not guessing. Replace the drawer liner each time you empty it.
This page is general information, not veterinary advice. Check with your vet before changing your pet's food or adding a supplement.
