Isopropyl rubbing alcohol. A blanket or sheet works well for larger dogs. Nylon slip leash - easy to get on and off. Clean towel or rag. A blanket to warm an animal in shock.
Some pharmacies carry a lightweight thermal blanket.
Hemostat or tweezers. Oral syringe or eye dropper to dispense oral medications. Sterile saline solution or eye wash and sterile eye lubricant for eye injuries. Pet Pectate, or similar product used to treat minor diarrhea. Again, consult your veterinarian before using.