What are the following job to choose from? the range of jobs in that field is very large. He could be a Research Veterinarian which would help him improve his knowledge of his field. He could also be an Asst. Veterinarian Consultant. That would help him get experience working with highly trained and educated professionals. Another job in which he could have while going to school could be a Diagnostics Lab worker. This would give him a deeper understanding of how and why different treatments are made.
Sorry if this wasn't what you were looking for.