Since the email in question wasn't included, we can't judge whether this was an appropriate response.
The email is here.
http://www.wftv.com/news/news/local/email-vets-harsh-response-after-dog-accidentally-e/nZYFh/
But actually - I’m not sure who is being snarked at.
????
I agree. It was a dick response, but I’m willing to bet the one he got wasn’t any better.
The veterinarian could use some grammar lessons.