To give some background, Ragnar is my 2 year oldish bulldog/German Sheppard mix & Sam is my 2.5 year oldish Dalmatian/pit(?) mix. We've had both dogs for about a year & a half, but we had Sam a little before we got Ragnar. Sam's past is a mystery, we adopted him from the pound. Ragnar, however, was rescued from an abusive owner. In the time that we've had both dogs, they've only fought over food, Ragnar being the one who starts it. But lately, Sam is the one starting fights. But there doesn't have to be food or toys. We can be having a quiet evening & suddenly Sam attacks poor Ragnar. Ragnar always attempts to back down but usually doesn't get the chance unless we step in. Last time I stepped in, Sam accidentally bit me & I couldn't walk for a week. Ragnar too has suffered injuries but they were minor. I don't know what's happening with Sam out of no where but I'm getting concerned. I don't want to have to make any difficult decisions. Is there a way to correct this unruly behavior?