Why Dogs Vomit and Have Diarrhea
Many pet owners automatically assume that when their dogs start vomiting and having diarrhea, it must be because they ate something bad and developed gastroenteritis. However, Dr. Liu Chun-jung, an emergency veterinarian at Taiwan National Animal Hospital, reminds owners that eating spoiled food is only one possible cause.
Gastrointestinal symptoms in dogs can also occur when their living environment changes, when they're exposed to new bacteria they haven't encountered before, or if they already have ongoing chronic conditions. In short, there are many possible reasons a dog might suffer from vomiting and diarrhea, and understanding the underlying cause is essential for proper treatment.
Understanding Gastroenteritis in Dogs
According to veterinarian Liu Chun-jung, gastroenteritis is a common illness in dogs. The typical symptoms include vomiting and diarrhea. In mild cases, a dog may have soft stools, while in severe cases, abdominal pain and bloody stool may occur.
When a dog develops acute gastroenteritis, it is often associated with eating something unsuitable. However, pet owners should also consider whether their dog may have come into contact with plants, leftover food, or garbage during recent walks. Environmental factors can also play a role—home renovations, nearby firecrackers, or other stressful events in the surroundings may cause psychological stress that leads to gastroenteritis.
How to Care for a Dog with Mild Gastroenteritis
According to veterinarian Liu Chun-jung, if a dog is suffering from mild gastroenteritis, proper rest and adequate hydration are usually enough for it to recover gradually on its own.
However, if the dog experiences severe abdominal pain that does not ease in a short period of time, shows signs of lethargy after vomiting and diarrhea, or continues vomiting and having diarrhea without improvement, it is best to take the dog to a veterinarian immediately.
Dogs with existing chronic illnesses or severe dehydration will definitely require medical intervention to ensure a safe and full recovery.
Should Dogs Fast After Vomiting?
Pet owner Dr. Liu Chun-jung explains that if your dog experiences both vomiting and diarrhea, it may help to let it fast for a short period to rest its digestive system. However, water intake remains important.
If drinking water seems to worsen the vomiting, Liu recommends withholding both food and water temporarily and seeking veterinary help as soon as possible.
He also adds that when a dog's stomach is upset, it's best to feed food that is easy to digest. Low-fat meals or softened dry kibble can help ease discomfort and promote recovery.
How to Protect Your Dog's Digestive Health
To keep your dog's intestinal health in good condition, veterinary expert Liu Chun-jung reminds pet owners to be cautious when changing their dog's food. It's best to make the switch gradually rather than all at once.
At the beginning, mix about 75% of the old food with 25% of the new food. Gradually adjust the ratio to half old food and half new food over time. The entire transition should ideally take one to two weeks.
During this period, observe your dog closely for any signs of soft stool, vomiting, diarrhea, fatigue, or loss of appetite. If none of these symptoms occur, it means the food transition has been successful.
In addition, regular health checkups, deworming, and timely vaccinations can also help effectively prevent gastrointestinal inflammation and other digestive issues.
