Possible Rescue Dog

It isn't unusual for neutered males to have issues with intact males. Personally, I would not leave the two alone together but then again, I don't leave any dogs alone together even if they have gotten on well for months or years.

In general, my rule of thumb is to expect a new dog who comes in as an adult or older puppy from a shelter, rehome or being a stray to take 4-6 months to fully settle in.

Also good article to read https://labrescuenc.org/blog/american-service-pets-impressive-results-or-scam/
 
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