Wet cupping, on the other hand, involves blood - letting by puncturing the skin with tiny needles before the suction is applied. (wellnessnova.com)
Common in most breeds during puppyhood and in retriever breeds at all ages, mouthiness means a tendency to nip, chew, and play - bite (a soft, fairly painless bite that doesn't puncture the skin). (dogtime.com)
According to the American Chemical Society, modern tattoo needles puncture the skin at 50 to 3000 times per minute, going through the epidermis, the outer layer of our skin, into the dermis, the inner layer. (sciencemag.org)