'Shock' is a term used loosely and often very incorrectly.
In both human and animal terms, it is much more serious than the slight feeling of malaise that might occur after a minor accident or fright which is often called 'shock".
The signs of true shock in dogs are:
If any or all of these signs occur after an accident or prolonged illness, treat for shock as below and call the vet immediately.
Keep airways open, giving artificial respiration or heart massage as necessary, bandage or splint any fracture or extensive wound.
Wrap the dog in a thick cloth or towel to conserve body heat.
If the dog is unconscious, keep its head as low as, or lower than, the rest of the body.
Gently massage legs and muscles to maintain circulation unless you suspect that they may be fractured or broken.
If the dog is conscious and restless, keep it horizontal and well wrapped up.
Get to the vet's surgery promptly. Time is vital, especially for the intravenous introduction of fluid in severe cases.
lf you absolutely can't get immediate veterinary help - either at all or for a few hours - give fluids orally.
If the dog is conscious administer an amount (depending on dog's size) of tepid water mixed with glucose every 30 minutes for 4 or 5 doses.
Don't give anything by mouth if the dog is unconscious, convulsing or vomiting.
Take pulse and breathing rate every 30 minutes and record them.
Note any blood in urine etc, and report these details to the vet.