I am not trying to sound morbid to scare you or hasty, I beleive you have
a dog in trouble, dogs dehydrate quick, and too much
pain in
a dog will stress the heart and the heart can enlarge...it can only go downhill quick...
Please try to contact the opinion of another vet!! Let us know, keep posting, so very sorry about your little friend distress w/the accident, hope you get the help you need!