First, you need to observe how your dog drinks water. Did it drink all the water in one breath, or did it stop after a few sips? If it is the former, your dog may just vomit because it is drinking too quickly.

This usually doesn't last long, just let it drink water slowly. However, if your dog starts vomiting just by drinking a few sips of water, there may be other problems. One possibility is esophageal reflux disease, which causes gastric acid to reflux into the esophagus and irritate the esophageal mucosa, causing vomiting or vomiting.

If your dog has other symptoms besides drinking water, such as loss of appetite, bloating, etc., then you need to take it to the veterinarian immediately. Another possibility is that your dog may have a digestive tract infection or gastrointestinal disease. This can lead to a decrease in the absorption of water by the dog, which leads to vomiting after drinking water.

If you suspect this is the source of the problem, you can pause your dog's diet and provide clean, fresh water. You can wait until your dog's nausea and vomiting symptoms disappear before gradually regaining its diet. However, if the dog's gastrointestinal disease symptoms last for a while, you need to take it to the veterinary.

Finally, you need to check if your dog drinks water in a bit inappropriate position. If your dog needs to bend its back to be able to drink water, this may cause it to swallow incompletely, causing vomiting. Make sure your dog has straight neck and head when drinking water so that it can swallow smoothly.