Why have the thyroid checked if they bite?
Bisa who will be 4 yrs old Christmas Day will growl, raise those hairs along her back, and show her teeth; sometimes tho she just 'goes after' whoever/whatever is irking her if they move too fast [ie: the GKs are playing with each and get too close to where she is laying].
Bisa liked our oldest son's mini beagle when Ginger was alive; got along great BUT she does NOT like the full bred AKC Australian Shepard pup they now have [now 8 mos old and she still goes after it!].
Bisa also growls and snaps at our grandkids [also see note above]. She has always been like this but it seems to be getting worse, hence my interest in doggie daycare and the suggestion of the thyroid being tested.
We board Bisa at the vets' office we take her to; began going to a new one recently due to being more convenient for me and has been an excellent place for her. Now looking at doggie daycare to socialize Bisa with other dogs/people. Went to a place recently to talk to the owner of it/the kennel/grooming shop she runs but haven't heard back from her after I called the other day. Was to take Bisa next week …