
Well that all sounds very familiar! The excitement when there is somebody at the door in particular. I went through this last year with one of my Malinois bitches. Trouble was, if the dogs were outside when somebody arrived (such as my husband coming home), she would get so excited she turned on one of my Papillons -and she ended up injuring his neck at one point. Nothing I did seemed to work. It got to the point where I was scared to have them outside together, as all it would take would be for somebody with a dog to walk past, excitement would start and bang, she'd go for the Papillon (she always knew to pick on the weakest one as well, that could not stand up to her.) I don't know WHAT did it in the end, but I had enough so took action. One day when she went for the Papillon I got really angry, dragged the bitch by her scruff into our grassy bit of garden that is fenced off, said nothing, just left her in there alone and went inside with everyone else. Left her out there for 2 hours all alone. I figured the worst punishment for her would be to be excluded. I ended up doing this on one more occasion. I ALSO started to call her to me each time something that made her excited happened, so if they were outside, I called her in, if inside, I called her to me. When she came she got a treat. I've no idea which worked, one or both methods, but she stopped acting like this and for a while when somebody arrived or a dog walked past etc she would run to the door to be let in, I let her in and she'd sit and stare at the pot of treats I keep in the hall. After a few months she stopped altogether, now if something happens she doesn't do anything. She was about 18 months when it all started.
It's now starting all over again, with my new pup -doing it to this bitch that used to do it herself! So far she's holding her own and telling her off but if it gets worse I shall try first with calling pup for a treat.
I've also got a Papillon who starts screaming in excitement whenever I am about to let the dogs out into the garden -and if left she will then chase after the oldest Malinois (!) and bite her hindlegs. That's a bit easier as all I do is pick the Pap up and don't let her out until she's calmed down a bit.