A dog's convulsions and inability to stand up may be caused by encephalitis, epilepsy, canine distemper, poisoning, metabolic abnormalities or mental illness. It is best to go to the hospital for examination. If the dog is deficient in calcium, it will also cause convulsions. However, this situation usually occurs in female dogs that have just given birth. If it is due to calcium deficiency, you need to go to the hospital for nutrient solution. You usually feed some liquid calcium and pay attention to the dog. Nutritional supplements for dogs.