- Kittens or adult cats weight five pounds or less will not trip the sensor. In the case of kittens, the user can unplug the Litter-Robot and cycle manually.
- The unit is recommended for cats up to 15 pounds, however, our Jaspurr, who is pushing 18 pounds and has a rather large butt, is able to use it comfortably. In fact, he was our first cat to christen it, and, as far as I know, now uses it exclusively.
- Elderly cats may find it difficult to climb into the globe.
- Diabetic cats may produce large urine clumps, which may not fit through the exit portals. In this case, the clumps can be manually broken up with a litter scoop.
- The unit may not be appropriate for timid or skittish cats.
Jaspurr was the sole user of the box for the first several days, but I then noticed Billy watching him intently while he was using it. It wasn't long before Billy was also closely observing the cycling process. Finally I found evidence that Billy had used the box, and ultimately, I was able to catch him in the act. His position with front feet perched on the lip is typical of his normal litter box position. Sometimes, he actually has three feet on the rim and daintly balances on one hind foot.
Since Bubba is too frail and arthritic to attempt entering the Litter-Robot, we oblige him with clean "regular" litter boxes upstairs and down. Which leaves our remaining holdout, Joey.
