I'd wash it real good with soap, cover with triple antibiotic ointment or neosporin, put a strip bandage on it and cover that with something so she doesn't chew it off.
Maybe there is a vet open on Saturday a.m.? Pain - gee I don't know what you could give her that won't make it worse except Benydril to relax her and you need liquid baby stuff and just a few drops. Sugar water may help if she's shocky. Advil or Tylenol not good for dogs. Asperin makes it bleed worse. I have used numzit for babies on scratches (for my dogs) but not on anything that deep/bad.
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Frankie (the MOM), Sabrina, and Elvira |