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Signs That Your Dog Has an Upset Stomach. Licks lips and/or swallows repeatedly. This may be a response to acid reflux. Eats grass. Grass can soothe a dog's upset stomach or induce vomiting. Diarrhea. Vomiting. Loss of appetite. Fatigue. Behavioral changes (lack of interest). Serious Symptoms
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The most common signs of upset stomach in dogs are diarrhea and vomiting. If your dog is nauseous, you may also see him eat grass to soothe his stomach or try to induce vomiting, says Jody Bearman, DVM at Anshen Veterinary Acupuncture, Madison, Wisconsin. Watch for other signs of upset stomach in dogs, such as:
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Oil found in canned tuna can cause unpleasant stomach upset in dogs, while onions and garlic are toxic to dogs.

Canned varieties of tuna are okay to feed to your dog on occasion, but because of the high levels of mercury and sodium, it's best kept as a rare treat.

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Citrus fruits and plants can lead your pet to an upset stomach. Eating food containing citric acid in small quantities can cause an upset stomach; however, eating in large amounts can cause serious trouble to your pet, including nervous system depression. Avoid giving your dog any kind of citrus fruits or plans.
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Canned Tuna or Salmon Canned fish has high levels of essential nutrients for your pup. Pick an option that is canned in water, not oil; and make sure it is salt-free, as seasonings can contribute to upset stomach. 3.
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As a long time Professional Pet Groomer and former vet's assistant I can tell you that a small amount of tuna (in water) should not bother a dog's stomach. I let my Miniature Pincher eat about a tablespoon of tuna anytime I make tunafish sandwiches.
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Moreover, the high protein concentration in dogs can also be problematic to some extent. When your dog eats a lot of tuna and ends up consuming too much protein, his digestive system may not be able to tolerate it. This can leave them with an upset stomach, which can be uncomfortable for your pup.
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Decreased appetite, upset stomach, diarrhea, and vomiting make caring for a sick dog stressful for both you and your pet. A bland diet can help relieve some of these symptoms while also giving ...
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It is important that you give it small amounts of food three times a day (morning, noon and night) for the stomach of the animal to adapt to the new food and digest it well. Keep to this bland diet for three days so the dog can feel better and won't throw up again. 3.
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Tuna is a great protein alternative for dogs with a sensitive constitution. It is easier to digest and less likely to cause digestive upset. Also, canned tuna based in oil can cause unpleasant stomach upset in dogs. Look out for the water-based ones.

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