Litter-Robot 4 vs 3 Comparison: We Tested Both Litter Boxes!
Whisker Litter-Robot 4 WiFi-Enabled Covered Automatic Self-Cleaning Cat Litter Box with Step White LR4-0101-00-US - Best Buy
Whisker Litter-Robot 4 WiFi-Enabled Covered Automatic Self-Cleaning Cat Litter Box with Step Black LR4-0301-00-US - Best Buy
Amazon.com : Litter-Robot 3 Connect & Ramp by Whisker - Automatic, Self-Cleaning Cat Litter Box, WiFi Enabled, Works with Any Clumping Litter, Designed & Assembled in USA (Grey), 1-Year WhiskerCare Warranty :