Hi, thanks for all the responses. The vet we went to see on Wednesday said that the tumor did need to come off, so Ozzy had surgery yesterday. The vet that removed it said that it looked quite suspicious, so that has me very worried! He hasn't been doing very well after the surgery either. When he was neutered, he was back to his old self by the time we picked him up, but he seems very distressed and uncomfortable now. He has to wear a HUGE head collar so that he doesn't tear the stiches out of his ear and it really seems to scare him. He just stands around shaking. He looks so pitiful! I can't get him to use the bathroom either. Every time I take him outside he just gets really freaked out and either tries to run, or stands in one place shaking. He has also gotten really defensive. If he can't see who's behind of him, he just automatically starts growling. That's definitely not his usual behavior. Has anyone elses dog had to wear one of these before, and if so, how long did it take them to adjust to it? If he doesn't start feeling better soon, I'm going to have to find another way to keep him away from the stiches! Thanks in advance for any help!~