Just found a large lump on my GSD's back
I just found a large lump on my GSD's back behind her should blades she doesn't mind if I touch it, almost fills like liquid inside but I don't want to pres s too hard and hurt her, I have no idea what this could be, I'm nervous. It wasn't there yesterday. She never leaves my side unless I'm at work. Anyone have any thoughts on this? She's fine otherwise eating, playing, drinking. Please Help!