Yes, I personally think it will pass. If you are worried aboiut it, when you hear the grumbles use a spary bottle and quickly squirt at the dog growling, they hate it and it will make them loose their train of thought..I read somehwere that it might take dogs several weeks to totally come to an agreement on each other, they still shouldn't try to kill each other but they might not learn to love each other until then either..To me it sounds like they are doing great. Let it take the time it needs. It is probably harder on Scooby, being the first and only dog and now there is a new dog on his block…but he will more then likely come around..
