Shadow~Wolf wrote:i am asking to educate someone else.
can a shock collar be used for a dog fixating on another household dog, tensing up and then attacking the other dog? said dogs have lived together for a long time and gotten along well.
or will it make the aggression worse, and not break up a fight?
I don't really agree with e-collars in general. Simplistic training will fix the problem without hurting the dog (good way to also gain a relationship with said dog). Typically, the collars will shock when the dog barks or makes a noise via its vocal cords. I feel as though it is cruel to restrain an animal from vocalising with other animals or itself.
If you are getting a shock collar to stop aggression it won't work. And considering the dog is fixating itself into a new household (even a house without a dog), you don't want the dog to find similarities between being at home and being hurt. Basically, you want to familiarise the dog into a loving household, over one that will hurt him.
I believe your safest bet is basic aggression training. You put the two dogs together under heavy supervision and pull the dogs away at any signs of aggression. You should also isolate the dogs (in same style environment - the dogs can get jealous which leads to future attacks) when they are not being supervised. This can be in two different cages or pens (make sure the areas have beds and maybe a dog toy in dependence of how long you'll be away. Make sure they are watered and fed and have gone outside prior to this).
Aggression can have a variety of reasons. Too much pent up excitement can be one of them and a play fight can quickly step over the lines into a full-on brawl.
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