Blood circulation to the ears?

[Pistol]

How do you kno if your cutting off the blood circulation when you tape there ears? I have taped my male gsd ears earlier today and I'm hoping that its not to tight, I don't believe it is but I wanna make shure. So how do you tell? And also how far into the ear should it go, I believe its only at the base to why I can squeez 2 fingers inbetween the ear and the foam, is that good or should I put it in farther?? Help much appreciated, new to taping ears