Moving an Injured Dog
While it's certainly easier to move an injured Yorkshire terrier than an injured Great Dane, the act still requires some thought and care. Remember that an injured dog may bite out of pain or fear, and you're liable to react without thinking if you're suddenly bitten. So for the safety of both of you, fashion a muzzle before you move the dog.
The most important thing when moving a dog is to keep the dog's whole body as stable as possible. You don't know what part or parts may be injured, so you want to avoid moving any joints at all. Use both your hands to cradle your Yorkie, or even use something solid that you may have handy, such as a piece of plywood, as a rigid surface under your Yorkie. If possible, place someone in charge of keeping the dog quiet and still while someone else drives to the veterinarian's office.
If your dog is injured but you don't know the details or the extent of the injuries (perhaps you were not present when he was hit by a car), you should assume that every part of the body is possibly harmed. The dog could have broken bones, internal bleeding, or lacerations hidden by the coat. Handle every part of the dog carefully as you load him into your vehicle to be taken to an emergency facility.