The dog kept clicking and vomited white liquid.

There are many reasons why dogs keep clicking and spitting white liquid. The following are several possible reasons and corresponding solutions:

1. Dietary problems: Dogs eat food that is not suitable for digestion or eat too fast, leading to indigestion. The solution is to stop feeding, let the dog rest for a while, and then gradually return to normal diet.

2. Gastrointestinal inflammation: Dogs may suffer from gastrointestinal inflammation, and the white liquid may be gastric acid or mucus. The solution is to take the dog to the vet for examination and treat it according to the vet's advice.

3. Intestinal obstruction: Dogs may eat foreign bodies by mistake, leading to intestinal obstruction. The solution is to take the dog to the vet for examination immediately, and surgery may be needed to remove the foreign body.

4. Intestinal infection: Dogs may be infected with intestinal bacteria, causing vomiting of white liquid. The solution is to take the dog to the vet for examination and treat it with antibiotics according to the veterinarian's advice.