About 8 months ago we took in a 1 year old male corgi (Ein), to be a friend for our 3 year old female corgi (Boomer).
Ein has a great temperament and LOVES other dogs, however Boomer does not. We walk the 2 of them together and they act like best friends. They play in our yard together with no problem.
However, in the house is a different story. Boomer behaves terribly and has tried to go after Ein. We have worked with a trainer and are trying her techniques but it's not working. We can never leave them alone together in the house because we cannot trust Boomer. Does anyone have any advice??