I have a 5/6 year old half catahoula half Idaho shag dog (collie, heeler, terrier mix) that is acting territorial to my new girlfriend. There's a bit of a laundry list of issues, but I think they are all stemming from the same thing. Him being protective of me and our space and I need some advice on how to break or change this behavior. He's never been super great with other dogs, but really hates specific breads - golden retrievers so I do keep him leashed up if other dogs are around.
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When she comes over he barks and jumps on her and kind keeps her at the door. He will also snap or snarl at my older dog (they have gotten along his whole life) if he comes near to greet her.
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If she c

