My cat caught a mourning Dove and punctured it's wing. How do I care fo it?

The vet should be ashamed of self. All birds that are attacked by cats need medical attention asap as cat saliva is toxic to birds. The bird needs to be seen by vet that sees injured wildlife and there are many that will or they will refer you to a wildlife rehabber in your area and you can take there. This is free for all wildlife. They will evaluate injury and start meds asap as infection that can be fatal sets in 48 hours of less. Also need to make sure wing is not broken. For now keep bird warm. Put in box or makeshift nest with heating pad set on low underneath enclosure. offer seed and water and keep cage or box half covered as stress can kill as fast as the injury. If still bleeding put flour on the wound to stop bleeding but don't let bird breath it in. Good luck and hats off for caring for it.