Great Dane Not Eating And Vomiting: Causes + What To Do 

A Great Dane not eating and vomiting are symptoms that sometimes occur together. Loss of appetite is a decrease in interest in food or a complete refusal to eat, which is an unusual dog behavior. 

This raises concern especially when accompanied by other concerning symptoms such as vomiting.

While vomiting is common in Great Danes, it is important to understand what causes these two symptoms and when to seek veterinary care.

We outline the potential causes of a Great Dane not eating and vomiting, what to do and when to seek help. 

Here’s why a Great Dane not eating and vomiting occurs

Vomiting itself can lead to loss of appetite and a Great Dane not eating. These symptoms  commonly occur together, and can be due to a number of illnesses and health issues which include diet change, food intolerance, illness, gastrointestinal infection, poisoning, stress, allergies, and medication side effects.  

great dane not eating and vomiting

Causes of Great Dane not eating and vomiting

A Great Dane not eating or experiencing loss of appetite is a common symptom of a dog suffering from vomiting. A Great Dane may experience both vomiting and a decreased appetite as a result of an underlying condition. 

The possible causes of Great Dane vomiting and not eating are:

Underlying illness 

Not eating and vomiting can be symptoms of a wide range of illnesses in Great Danes, including viral or bacterial infections, gastrointestinal disorders, and systemic diseases.

There are many factors that can cause a dog to not eat when they are ill, which include pain, nausea, digestive problems, and emotional distress

Pain due to an illness can cause a Great Dane to avoid eating or drinking. In addition to this, many illnesses can cause nausea which can make them feel too sick to eat.

Digestive problems due to illnesses such as vomiting or diarrhea can also lead to a lack of appetite and emotional distress experienced when they are ill can cause them to also lose their appetite.

Gastrointestinal infection

Gastrointestinal infection by bacteria, intestinal parasites, or viruses can cause Great Dane vomiting and loss of appetite.

Gastrointestinal infections can cause a dog to lose its appetite due to nausea, vomiting, pain, and discomfort. These symptoms can lead to a loss of appetite in a Great Dane.

Related: Great Dane throwing up: Causes, symptoms and when to seek help

Change in diet

A change in your Great Dane’s diet can cause vomiting and refusal to eat due to food intolerance or allergy, an upset stomach, and stress.

This is because it takes time for your Great Dane’s stomach to adjust to the new food and a sudden change to a new food may cause vomiting. 

Great Danes are also sensitive to changes in their routine and environment, and a sudden change in diet can be stressful. 

The stress can lead to digestive upset which causes vomiting and other symptoms and a dog not eating due to :

  • Taste preference: Great Danes have preferences for certain flavors and textures of food, and if their new diet is not appealing to them, they may refuse to eat it.
  • Digestive issues: Switching to a new diet can cause digestive upset which can cause a dog to feel sick and not want to eat.
  • Food allergies or intolerance: Some Great Danes may have allergies or intolerances to certain ingredients in their new food, which can cause gastrointestinal upset and loss of appetite.

If you are planning to change your Great Dane’s diet, it is important to do so gradually over a period of several days to allow their digestive system to adjust. 

See Also: Understanding causes of Great Dane sensitive stomach


A stressed dog also experiences vomiting including loss of appetite, which may appear at the same time. 

Stress can cause a dog to lose its appetite in different ways. One way is stress can affect a Great Dane’s digestive system, causing nausea, stomach discomfort, and other digestive issues. 

This can lead to a loss of appetite as a Great Dane associates food with discomfort or they may simply not feel hungry.

Stress can cause changes in the Great Dane’s hormone levels, particularly the stress hormone. Elevated levels of the stress hormone can cause a decrease in appetite. 

Chronic stress can also suppress the immune system, leading to other health problems that can further affect their appetite. In addition to this, stress can lead to depression or anxiety, which can also cause a loss of appetite in Great Danes.

Stress and anxiety also cause a variety of symptoms including pacing, licking, drooling, yawning, crying, barking, and hiding.

Stress can come from a variety of sources such as a change in their environment or routine, new people or pets, loud noises, and other fear-related stressful situations.

Toxin ingestion

Poisoning in Great Danes can lead to a range of symptoms, including vomiting and not eating. This is because many poisons can cause gastrointestinal upset and also affect a Great Dane’s appetite.

Loss of appetite can happen because of:

Nausea and/or vomiting: Many poisons can cause nausea or vomiting. When a dog feels sick, they may refuse to eat or drink.

Mouth ulcers and irritation: Certain toxins can cause ulcers or irritation in a Great Dane’s mouth. This can make it painful for the dog to eat or drink.

Organ damage: Some toxins may cause damage to a Great Dane’s liver, kidneys, or other organs which can lead to a loss of appetite, as well as other symptoms.

Neurological problems: Some poisons can cause neurological symptoms such as seizures or tremors which can make it difficult for a dog to eat.

A Great Dane may accidentally ingest toxic substances such as household cleaners, contaminated food or water, pesticides, insecticides, poisonous plants, or human medications, which can cause vomiting, loss of appetite, and other symptoms.

Side effects of medication 

Medications can sometimes cause side effects in a Great Dane, including vomiting and refusal to eat. 

Many medications can cause gastrointestinal upset, including nausea, diarrhea, and vomiting, which can lead to a decreased appetite. 

The taste or smell of the medication can also be unpleasant, making a dog reluctant to eat.

Some medications also affect a Great Dane’s sense of taste or smell, altering the way food tastes or smells, which can reduce their desire to eat. 

A Great Dane’s mood and behavior can also be affected by some medications which lead to a decrease in appetite as a result of anxiety or depression.

Great Dane not eating and vomiting: What to do 

If your Great Dane is not eating and vomiting, it is important to seek veterinary care as soon as possible. 

Here are  other signs that indicate that you should see a veterinarian immediately:

Severe or bloody vomiting: If your Great Dane’s vomiting is severe or if there is blood in the vomit, this could be a sign of a serious underlying condition and requires immediate veterinary attention.

Additional symptoms: Other symptoms may accompany vomiting and not eating, such as diarrhea. If your Great Dane is vomiting along with diarrhea, this can lead to dehydration and other complications. This requires immediate medical attention. 

Other symptoms to look out for include lethargy, breathing difficulties, signs of pain or discomfort, fever, and signs of dehydration, such as a dry nose or mouth and sunken eyes.

If your Great Dane is a puppy or an older dog: Puppies and older are generally more vulnerable than healthy adult Great Danes so delaying treatment could result in their condition worsening or becoming more difficult to treat. Therefore, it is essential to seek immediate medical care.

Suspicion poisoning: If you suspect that your Great Dane has been poisoned, it is important to seek veterinary care immediately.

Key Takeaway: Great Dane not eating and vomiting

Not eating and vomiting in Great Danes can be caused by a variety of factors. While occasional vomiting is normal in Great Danes, persistent vomiting alongside other symptoms such as loss of appetite requires veterinary attention.

If you notice your Great Dane showing these symptoms suddenly or for extended periods of time, consult with your veterinarian to determine the underlying cause and appropriate treatment. 

By addressing the underlying cause of the symptoms and providing appropriate care, you can help ensure that your Great Dane remains healthy.

Related Posts