Garmin Alpha TT25 Mini GPS Dog Tracking & Training CollarGarmin Alpha TT25 Mini GPS Dog Tracking & Training Collar. The Garmin Alpha TT25 Mini is the compact form TT25 for smaller breed dogs that still need full tracking and training capability. Same 9 mile range, 18 stim levels, 7 color LED, and Wi Fi auto update platform as the full TT25, sized down for beagles, smaller pointers, terriers, and other compact hunting dogs. Key Features Compact form factor for smaller breed dogs Tracks GPS up to 9 miles