Why do dogs spit out as it is when they eat dog food? There may be several reasons why dogs vomit as they are after eating dog food:

1. Eat too fast: If dogs eat too fast, it may cause them to swallow directly without chewing food, and these undigested foods may clog the stomach or irritate the stomach wall, causing nausea and vomiting.

2. Dietary problems: Dogs may also cause digestive problems and vomiting if they often eat expired, spoiled, or unsuitable foods.

3. Disease: If a dog suffers from gastrointestinal infections, viral infections, gastroenteritis and other diseases, it may also lead to vomiting.

4. Other reasons: If a dog eats indigestive substances, such as bones, toys, rubber, etc., it may also cause vomiting.

If your dog often spits out the same dog food, it is recommended that you take the following measures:

1. Control your diet: Let your dog eat slowly, do not let your dog exercise vigorously after meals, and avoid excessive drinking of water.

2. Increase water consumption: Let the dog drink enough water to help digestion and prevent stomach blockage.

3. Gradually change your diet: If your dog’s vomiting problem is related to food, you can gradually change their diet to adapt to new foods.

4. Seeking medical treatment: If the dog's vomiting problem is serious or continuous, it should be taken to the veterinary office for examination in time to determine the cause of the problem and to treat it.