HAVE WORKED MY DOGS WITH COLLARS ON SINCE I WAS OLD ENOUGH TO BE ALLOWED A LURCHER 14 YRS OLD,IM 30,NOW NEVER HAD A PROBLEM,AND THATS A LOT OF LAMPING,ALSO WHEN UR RUNNING THE BIGGER STUFF,ITS ESENTIAL YOUR DOG HAS A COLLAR ON,AS IT MAKES LIFE EASYER,TO GET THE DOG OFF,ALSO IT PROBABLY HELPS NOW AND AGAIN,PREVENTS YOUR DOG FROM GETTING NECK AND THROAT BITES,MANY TIMES IVE LOOKED AT BITES ON THE COLLAR,MUST HELP!!!IVE ALSO SEEN THE QUICK RELEASE COLLARS USED AND I THINK THEY'RE CRAP,THE COURSING ONES ARE BETTER,BUT MOST THE LAMPING BOYS I KNOW ARE TOO TIGHT TO,BUY A SLIP LET ALONE SPEND £20-£