:help:I’ve noticed lately within the last couple of days that Blue, my 20 wk old GSD will occasionally go over to Scooby my 3yr old Catahoula and nip/bite him. It’s completely random, and as the days go by it has started escalating to the point where when Blue gets next to Scooby, Scooby will immediately snarl and show teeth. It has ended up in about 3 dog fights, with one of the fights drawing some blood from Blue’s nose. Our next training class isn’t until Saturday. Which I plan on discussing with the instructor on ways to solve this sudden behavior. Any suggestions on why he could be doing this? Just to clarify, I keep a constant eye on the dogs, and when I’m not home both dogs are in separate crates. Both dogs get equal amount of attention, and are fed at the same time. Both dogs know I’m the alpha, although Blue is going through a very testy period right now where he is driving me crazy with testing boundaries. Just wondering if this has to do with him trying to be dominate?