[royalarrival]

My Mother-n-Law has a lab with thyroid problems. He is currently on meds to control it. He did become dog aggressive as he got older (and leading up to diagnosis of thyroid disease). We couldn't take our Daisy over to their house. To this day the lab is still dog aggressive (even on meds.). He went through puppy class and all, but still aggressive.

I don't know if meds would make a difference.