My dog, Bear, has developed extreme cunning in getting out of whatever device I have on him – buckle collar, body harness (two different styles), Halti head halter – or any combination of these. The only time he was unable to free himself was when the buckle collar was too tight for safety or comfort. Bear’s strategy appears to be to face me, pull backwards, and hop around on his back legs until he pops out of his restraint. Even with the belly band of his harness on tight, he managed to wiggle his elbows through it and pull out backwards.