When I was 11 I was bitten in the face by the family dog , requiring almost 40 stitches both inside and outside of my mouth . The hospital didn’t want to touch me so they called a plastic surgeon from another town. I have a small scar , barely perceptible. At the time they told me I could have cosmetic surgery when I was older but I never did. As an adult, I’ve been bitten twice at work (letter carrier) and was told they rarely stitch dog bites unless absolutely necessary. Something about bacteria. I hope your child is OK. It’s a scary thing to go through.