I have 5 dogs and they have all gotten along really well until Max my 7 month old turned 6 months. Max is fine and such a sweetie but my dog Joey randomally went after him one day. Max wasn’t doing anything but standing in the middle of the living room, Joey walked up, gave him a sniff and then went after him. Then after that once in a while Joey will do it again, and only Max. At first I though it was cause Max was maybe smelling different cause he isn’t neutered yet and from past experience I have noticed some dogs don’t like intact males. So I always keep a close eye on them. 95% of the time they are fine, they even play, sleep together, but Joey is still going after him randomally. Now I think it’s protectiveness, cause my roomie and I were on the couch, joy was by are feet and he started growling at any dog that came close, Max jumped on the couch and Joey just went after him. My question is how do I get this behavior to stop? Max never fights back just cries, I feel so bad. Joey is also starting to get protective over a new kitten we got and will growl at any dog that comes by. When he does this I say a firm no and use my body to move Joey back and lay down and it helped with that. But with Max is seems so out of the blue and usually Max isn’t doing anything.