When he started walking he left a big pile of blood splatter and trails.
Go to the vet!
Take him to the vet
Have an opinion?
Take him to a vet. Look for a 24 hour vet in your area
Bring him to the vet RIGHT NOW Try and stem the bleeding If you have quick clot goodIf not bandages and slight pressure
If it's a emergency use either honey or petroleum jelly to try and stem the bleeding Apply to the wound
why is this in the sexual-behavior section? what where you doing to your dogs penis?
Go to the vet dude!