Minor foaming is not necessarily the most serious stage, but it should be the middle and later stages, so timely treatment is required, otherwise the dog's condition will become more and more serious and even life-threatening. The incubation period is about three to five days. In the early stage, vomiting, diarrhea, poor energy, loss of appetite, etc. will occur. Once discovered, it is best to send it to the hospital for examination and treatment immediately. The hope of cure is relatively high.