With Tug we think there's Rottweiller, Golden Retriever, maybe German Shepherd, Sheltie... We only know his Mom, Sienna; she was kicked out of a car; long story.
I've been very lucky with Tug; no issues with reaction once he was out of his little puppy hood. He sometimes starts, but doesn't pull. I don't know if Rescue Remedy would affect her protective nature; that sounds like Chow, to me
I've been very lucky; he's got the calm, placid disposition of a newf. I've only had one issue with him and other dogs; two GSD's that don't get along with anyone at the K9 daycare. Tug's usually the one teaching the puppies manners & how to play nice. I wish I had pictures of when he had a boxer pup attached to one ear :lol:
Good luck!