Unfortunately, accidents are bound to happen when working with live animals. If you cut your dog’s tongue, have them lick sugar to stop the bleeding. Otherwise, clean the wound with antiseptic, apply a gauze pad, and wrap it up with vet wrap.
It’s best to take your dog straight to the vet rather than waiting for it to heal. Your dog may need stitches or antibiotics.
The hardest part is forgiving yourself. Even professional groomers cry when they accidentally hurt a dog. Just remind yourself that accidents happen, and you were trying to do what you thought was best for your pet. Your pup loves you and will probably forgive you before you forgive yourself.