My ND/pygmy/ish goat has an underbite too! It was worse with his baby teeth when I first got him and I was a lil worried. My vet said he never saw one so bad..e but now he is 6 months old and a healthy happy tree eatin piggie
He looks like hes smiling or puckering up for a kiss most of the time and I think its adorable. What he lacks in breeder quality, he makes up for in personality
Here is a pic of him now which his teeth are much better in. Just watch your kid and make sure he eats that's all you can do.. unless someone invents goat braces Hmm ..