Doc, you stole my thunder,Haha,well said.
I want to expand on something Doc mentioned, Only use Peroxide "ONCE"!!!! Reason being, peroxide kills "germs", but also kills the antibodies that the dogs system is building to fight infection.
When in doubt, about anything you can use on a horse wound, you can use on a dog wound. You can get most anything you need from the local feed store.
The best advise is if you don't know what to do, stop the bleeding, and haul a$$ for a good vet clinic.
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"IF YOU'RE GONNA TALK SMART,YOU BETTER RIDE A FAST HORSE"