My big boy Apollo got a 3 inch gash on his neck, about 1/4 inch deep. No clue how he got it, but he did have a little sore there that I had cleaned up, but what I think happened was that there was buildup of puss underneath the skin. He must have finally scratched hard enough & ripped it open with his nails. $311 later & a trip to " Puppy ER " & all is well. Has to keep this thing on for a week to 10 days. Oh yeah, you guys wanna see something funny ?? Have your bully on morphine. He was so dope drunk, it was hilarious. Until I had to pick up his 89 lb dead weight body & bring him in the house.