It is not possible to give proper advise on cases like this without seeing the dog. The best would be to find a good behaviourist in your area with experience with wolfdogs (what very likely will be impossible) or someone with much experience with wolfdogs.
There are too many possible reasons for that behaviour.
The most common is comming in heat combined with not clear enough rules for the dog. In my experience most adult wolfdogs don´t like every other dog but can be controled in that by obedience.
Tatra
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