Dog head halter is designed for heavy to extreme pullers An easy-to-use harness for friendly pull control Gentle guidance from the withers, not around the face Designed for dogs over 59 kg weight; recommended for Mastifs and Oversized dogs breeds Available in x-large size and black color Designed for Heavy to Extreme pullers! An easy-to-use harness for friendly pull-control. Gentle guidance from the withers, not around face. Stops Pulling Instantly! No "Muzzle" Look. Recommended by Trainers and Veterinarians. Converts to a Collar in Seconds! (Just pull the webbing through the D-Rings). Small-Up to 25lbs., Medium -25 to 60lbs, Large-60 to 130lbs., X-Large-Over 130lbs.