Leo was neutered last week and all was going fine until last night. He licked himself until he developed a golf ball size blood clot. The Vet gave him some antibiotics and pain pills. If the blood clot gets bigger he has to have more surgery. To keep that from happening I had to put an E-collar on him & he hates it. I have never had to use one of these before on any of my animals. I keep wanting to take it off but I know it's better than the alternative. If any of you have used this I need you to tell me to leave it on and that he'll get used to it.