You will need to trim the hair around the area. It would be better if you could do this today rather then tommorow, just place her in the bath tub so if it is still bleeding it wont make a mess.
The following basic wound care instructions are brief and easy to follow
If the wound is small, you can leave it uncovered; it will heal nicely on its own. Cover larger wounds with gauze pads and tape them to the shaved or clipped skin.
If your dog can't reach the wound, place some antiseptic ointment on it. You said he is leaving it alone so it will be ok to do this but just watch and make sure he is not eating or licking the area.To ensure fast and complete healing, follow up with a gentle cleaning once or twice a day. Use gauze pads soaked in some fresh, diluted antiseptic solution.
If the wound does not appear to be healing properly (if it feels hot or swollen, or appears to be more painful for your dog that it was at first), call your vet .
Your cleaning and caring for this area will be the result of an infection or lack there of so it is very important to clean this area.If you have any other questions please feel free to ask. I hope this has been helpful please accept pay and feedback.thank you bonus always appreciated dogfirstaid101
I can not really say how long without seeing the wound but i would say give it an hour or two and then try and change the bandage.