Most dogs under 25 pounds are very comfortable on the machine. Some larger dogs up to 40 pounds also use BrilliantPad.
Frankly, it's not an absolute weight issue. A 175 pound human can jump up and down on the machine without breaking it!
The real question is how much room does your dog need to circle dance before going potty? Can your dog go potty on a pad that measures 24 x 23 inches? If so, great!
If your dog need bigger pads or multiple pads then BrilliantPad may be too small for your dog.