Hi,
We meet up with friends every couple of weeks who have a 9 month old border collie. Toward other dogs, the border collie is submissive and friendly. However, when they brought the border collie into our home for the first time, it instantly snarled at our 8 month old Golden Retriver who loves other dogs and just wants to play with them.
Today, we took both dogs out for a walk together and they were both fine when on their leads. Some time later on the walk, we took their leads off and let them run around on the beach when the border collie attacked our dog. We immediately intercepted them so it didn't escalate into anything major but it seems strange to us why the collie is so submissive to every other dog except for ours.
Is there any way of resolving this issue?