My dog,Cole,is a year and a half. He is very socailized,loves dogs,and listens well. He has been around kids all ages since he was a pup. Anyway about 4 days ago when it was hot (over 90) we went over to my wife's aunt and uncles house.They have a chocolate lab and the neigbors have a pit bull. My dog goes over everytime and plays with the pit they get along great.Later that night my kids had a few friends over to swim. A 10 and a 7 year old.Both kids have dogs to they know how to behave. Well I go inside to get a drink and I come out to hearing the 7 yr old say Cole bit his butt. I looked and there was fang marks there. I don't know why,he's great and was in the yard with this kid for hours. He was hot and started getting diarea,so I made him go into the air conditioning. Do you think he was hot and iratated?any thoughts? I hate feeling that I have a bad dog,I tried so hard to make sure this won't happen.