AVA Electric Dog Bark Collar Upgrade 2018 [Revolution Energy Controller] x2 Work Time - Vibration No Shock - No Bark Collar Small Medium Large Dogs Best Barking Collar - Pet Safe Waterproof Features ruffles and flower print with sequin decorations Hook and Loop closures for easy access on and off 100-percent Cotton (Shell); 100-percent Cotton (Lining) Available in Pink and Brown in sizes ranging from Small to Large Size Large: Neck - 11.4", Chest - 15.8"