After being poisoned, dogs will have a loss of appetite and will not be interested even in the food they like to eat. When a dog is poisoned, he or she will usually drool excessively, then begin to vomit, foam at the mouth, and may even vomit blood. In addition to these, diarrhea, lethargy, convulsions and difficulty breathing may also be symptoms of dog poisoning. In severe cases, screaming, running wildly, and banging their heads against walls may occur; dogs with encephalitis may show Symptoms include: elevated body temperature, abnormal mental state, constant barking, loss of appetite, failure to recognize the owner, lethargy, limb imbalance, general weakness, aimless running and collision with obstacles, etc. There are also some dogs that have slow reactions, retreat in circles, and convulsive twitches, or have drooping heads, dilated pupils, half-closed eyes, or even immobility against obstacles above their heads.