My puppy is 8 months old and has been very well socialized, but his behavior is different when he's let into the backyard. I used to watch him at all times, but on the couple days a week I can't take him to work, my family is lazy and just lets him out with the two terriers without supervision. The two little ones yap constantly at ANYTHING and I was trying so hard to avoid that with Pax. Unfortunately, he's copying their behavior now and is obsessive about anything and everything and will bark constantly, not listening to me unless I pull him away from the fence. Our yard faces a park, so there are a lot of people and dogs walking by all the time. I wouldn't mind if it was one or two barks to announce that something is there, but the CONSTANT barking is hard to deal with. Ideally, I'd like all of them to break the habit and am open to all suggestions. I have tried food, but they're so obsessed with the fence and the little ones run back and forth and sometimes wont let you catch them.