Hey! I've got a wonderful Malinois, he's great fun to be around and got all the traits a malinois is supposed to have. He's soon going to turn two years old (in may). However he's got some issues, to say the least, with other dogs we encounter on our walks. Im going to start off with telling you guys how a normal day in our lives look. This is to emphasize the fact that he is in no way understimulated - unless he's some sort of stimulation-craving doom-dog . So, me and Rollo spend 24 hours of every day together. I work at a day-care for dogs and so we meet around 40-50 dogs every day, and has been doing so since Rollo was about three months old. After a long day of walks and missions in the woods with the other dogs - which Rollo helps me herd, making sure none of them strays too far from the pack - we spend about thirty minutes or so obedience training. In the weekend we often throw freesbees until we drop. I think it's safe to say that Rollo is a very active dog and he's got a great attention when we're obedience training. Now to the actual problem . Picture us walking, eye-contact almost unwavering (if I want it to be). Fifty yards ahead of us Fifi the bichon havanais, with her 60+ owner comes walking along towards us. Rollo has seen the other dog and his attention starts to split a little bit, but he's still focused enough on me. Fifi is getting closer and Rollos attention is still fine. When Fifi is just five small yards away, Rollos concentration suddenly breaks. He's become convinced that Fifi and her 60+ owner is going to murder us, and so he lunges towards them sounding like he wants to end both their lives and thus save the day. 2 or 3 out of 10 of these situations I manage to keep his attention and avoid a confrontation, but only if I brought something super-fun along, like a stick or a freesbee, although that trick doesn't always work. I'm not some meek guy with my feet pointing inwards, I walk with a straight back and Rollo knows in all other situations who's in charge, and yet he feels the need to protect me from dogs the size of his left hind-leg. To clarify, it's not just small fluffy dogs he hates. Basically he hates every other dog he sees initially. Even his friends from day-care seems to be a huge threat, until he actually meets them and realize he already knows them. If Rollo were to be off-leash in the Fifi-scenario he would run up to the other dog, looking very hostile indeed, head and ears reaching for the sky, tail pointing straight up and a nice long ridge of hair going from the neck all the way to the tail. By this time Fifis' owner is probably scared half to death. Then, when Rollo reaches the other dog, he just stops, assert his dominance and runs back to me. Needless to say the damage is already done, Fifi's owner is probably inches from a heart-attack by then. Rollo has never hurt another dog, he just speaks a language that is incredibly hostile. I want all of this to completely go away, he doesn't need to be playful or fool around with other dogs, I just want him to feel calm and pass other dogs like they are no more important than ants. I have no idea where this behavior comes from, I mean, he's been socialized since puppyhood for god's sake! When we work during the days I walk him with 4 other dogs without any problem at all! If Fifi were to start going to our daycare, he wouldn't bat an eye, he'd be super friendly. Usually Malinois are very sensitive and attentive (correct me if i'm wrong), but Rollo is a tough guy. He's not phased at all if I get mad at him for behaving like a jerk towards other dogs. In other situations, like that time he ate one of my pillows, he was soo ashamed, but when it comes to agression, it's a completely different matter. The strangest thing about his behavior is that it is non-existant when I'm working. It is as if other dogs are not the actual threat, the threat is the confrontation during our walks. Rollo's never been the playful guy with other dogs, he's more people-oriented, that's where the fun is at in his world. I've got some ideas on how to train this agression-issue, but I'd love to get some input from you, if you have read this far (sorry for the essay). One of my plans is going into a densly dog-populated area and sit on a bench for hours with Rollo beside me, watching other dogs go by. When he manages to stay calm he'll get a treat, you get the idea. The goal is to de-sentisize, making Rollo blasé of other dogs. The other solution I've been thinking of is to neuter him. It may or may not work, but being a guy I somewhat dislike the idea and it feels like a shortcut, the easy and lame way out. Plus it may not work at all. However, one of his testicles is not where it should be and supposedly that may increase testosterone production because of the extra warmth from being somewhere up in his tummy. Anyway, that's what I've got to work with. I'd love to hear if you have similar stories to tell or if you have any ideas on how to counter Rollos behavior. I'm still holding on to the hope that it's just a youth-phase, but I suppose that might me wishful thinking .