I'm not understanding this.. "an injury is an injury"? There are several different types of injuries that a chin can have. Don't just trust that vet's judgement, especially if they don't specialize in chins. Ask as many general questions about chinchillas as you can. Write them down if you have...
When I first got my chin, I posted on this forum including my daily routine for my chinchilla to make sure it was acceptable. I was a fishkeeper for 6 years, particularly with aggressive tropical fish such as bettas, and I know how misinformed a pet owner can become if they don't do the proper...