Is there a effective way to repair a harelip in a puppy ? Nothing else is wrong with him, does not include any pallett problems and he nurses from the mom fine. At what age should it be done and do you know if it is exspensive ?

This is often part of "failure to thrive" syndrome. The Vet who assisted in the breeding and delivery should be able to help you and is the person to ask.

Merck Veterinary Manual

Yes it is fairly expensive. Not sure on the age. But why? Is he a show dog? What breed?