FinnishLapphund
There's no cow on the ice
I'm so sorry to hear this.
But to try and find something positive, as you say, he was just castrated, he is still sore and not rid of all his hormones yet. Also about when the first attack happened that you described, it is not unusual that when you have a dog with Gizmo's problem of wanting to be top dog, that they attack when arriving home from a walk or leaving home going out for a walk, I don't remember why but it is something about those situations that heightens the tensions.
I don't know what you should do, but until you make your mind up, keep them separated indoors but not out of view, maybe you could divide some of your rooms in two parts by puppy pen parts or maybe they could e.g. take turns in being in a crate. When you come home, don't release Gizmo from his lead and collar, without keep it on him so that you still have control over him.
Then you get a chance to see if things settle after the castration, get a chance to find a behaviourist that maybe could help you on what options you have, so that you feel you've really tried everything/have given him every chance before deciding if he should stay or what to do if he doesn't stay.
Personally, I don't like the fact that it sounds as if there is such a difference between his behaviour, that it is such a night and day so to say between wanting to be top dog over Louis one moment and very submissive towards other dogs you meet out on walks next moment. As you say, his previous owner have a lot to answer for with not socializing him properly, though let us not forget that with some dogs even proper socialization does not help.
Maybe it is simply to stressful for Gizmo, going from living like he did to try and live as a normal dog with all the impressions of everything going on around him. Maybe while meeting other dogs out on walks, all the people, noises and traffic etc, Gizmo builds up frustration over trying to deal with it and then he tries to be top dog over Louis, to get some of that frustration out of his system or to feel that he at least can boost his confidence that way?
If so, maybe taking a step back and letting him take ''smaller steps'' back out in reality, with less impressions, letting him meet less strange dogs etc, could help? Though I admit, I think that sounds a little far fetched myself, but I'm trying to think of anything that could help.
Again I'm really sorry to hear this and I hope Louis and your OH heals quickly.
But to try and find something positive, as you say, he was just castrated, he is still sore and not rid of all his hormones yet. Also about when the first attack happened that you described, it is not unusual that when you have a dog with Gizmo's problem of wanting to be top dog, that they attack when arriving home from a walk or leaving home going out for a walk, I don't remember why but it is something about those situations that heightens the tensions.
I don't know what you should do, but until you make your mind up, keep them separated indoors but not out of view, maybe you could divide some of your rooms in two parts by puppy pen parts or maybe they could e.g. take turns in being in a crate. When you come home, don't release Gizmo from his lead and collar, without keep it on him so that you still have control over him.
Then you get a chance to see if things settle after the castration, get a chance to find a behaviourist that maybe could help you on what options you have, so that you feel you've really tried everything/have given him every chance before deciding if he should stay or what to do if he doesn't stay.
Personally, I don't like the fact that it sounds as if there is such a difference between his behaviour, that it is such a night and day so to say between wanting to be top dog over Louis one moment and very submissive towards other dogs you meet out on walks next moment. As you say, his previous owner have a lot to answer for with not socializing him properly, though let us not forget that with some dogs even proper socialization does not help.
Maybe it is simply to stressful for Gizmo, going from living like he did to try and live as a normal dog with all the impressions of everything going on around him. Maybe while meeting other dogs out on walks, all the people, noises and traffic etc, Gizmo builds up frustration over trying to deal with it and then he tries to be top dog over Louis, to get some of that frustration out of his system or to feel that he at least can boost his confidence that way?
If so, maybe taking a step back and letting him take ''smaller steps'' back out in reality, with less impressions, letting him meet less strange dogs etc, could help? Though I admit, I think that sounds a little far fetched myself, but I'm trying to think of anything that could help.
Again I'm really sorry to hear this and I hope Louis and your OH heals quickly.