This is most likely a problem with the dog's gastrointestinal tract. It may be caused by eating unclean things, sharp objects scratching the intestines, etc., which can cause gastrointestinal bleeding. It is best for parents to abstain from food and water for a period of time. , observe the dog’s follow-up condition, and if the condition is serious, it needs to go to the hospital for treatment.

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Vomiting red mucus may also be caused by other reasons. If parents are worried, it is best to take the dog to the hospital for a detailed examination.