Home / Canine Feeding / What a dog cant eat

What can't dogs eat

We often assume that dogs can eat anything, just like us. However, as we delve into the subject, we encounter an abundance of information. In this article, we will explore the difference between foods that are truly forbidden, those that are dangerous, and those that may be challenging for dogs to digest. We will also delve into the consequences and symptoms, providing you with a comprehensive understanding of the real risks.

what can dogs can't eat: WHAT ARE THEY?


Grapes and raisins can be highly toxic to dogs. Even in the smallest quantities, they can lead to kidney failure. The exact reason why grapes are so harmful to dogs is still unknown, but studies indicate it may be due to certain components. The toxic effect of grapes is not limited to a specific variety or whether they have seeds.

It is equally dangerous to give a dog raisins or foods containing grapes and their derivatives.


Chocolate is highly toxic to dogs regardless of the amount or frequency of consumption. The toxicity lies in the theobromine content in cocoa, which dogs cannot metabolize, leading to its accumulation in their bodies. Even if a dog consumes a small amount of chocolate occasionally, the theobromine accumulates over the years and can cause kidney failure.

Since all types of chocolate or chocolate-containing foods contain cocoa, none are exempt from theobromine. Dark and pure chocolates contain the most theobromine, and just 25 grams of dark chocolate can be enough to poison a 20-kilogram dog.

A small amount of chocolate may only cause stomach upset, vomiting, or diarrhea. In larger quantities, theobromine can lead to irregular heartbeat, seizures, muscle tremors, internal bleeding, or a heart attack.

Hyperactivity is an initial symptom of theobromine poisoning in dogs.


Both onions and garlic contain sulfur compounds that can destroy red blood cells in dogs and cats, causing anemia. These compounds are present whether the food is raw, cooked, or in powder form (as a seasoning).

Onions are slightly more toxic than garlic, but the toxicity depends on the ingested dose and the size of the dog. Significant ingestion, such as half an onion or a whole onion at once, or multiple onion pieces daily, is required for serious problems to occur. If a dog consumes small doses occasionally, no harm or poisoning is likely.

Symptoms of onion or garlic poisoning include vomiting, diarrhea, orange/red-colored urine, lethargy, difficulty breathing, and an accelerated heart rate. It's important to note that these symptoms do not manifest quickly but appear 5 or 6 days after ingestion.


Alcohol is, of course, dangerous for dogs and can cause severe damage as they cannot tolerate it. Avoid giving your dog foods that contain alcohol.

If you suspect your pet may have been poisoned by alcohol, watch for symptoms such as an inability to walk properly, low blood pressure, lethargy, swelling, vomiting, diarrhea, and even seizures.

Other Dangers on the Canine Plate: Beyond the Obvious Prohibitions

In our exploration of the secrets of the canine culinary world, we cannot overlook other foods that hide dangers for our loyal friends. It is crucial to understand that some elements, although not directly toxic, can have adverse effects on the health of dogs. Here, we present a list of other foods you should avoid:


While we enjoy avocado in our salads and on toast, this fruit contains a substance called persin, which can be toxic to dogs and cause stomach upset.

Raw Green Tomatoes

Raw green tomatoes contain solanine, a toxic substance that can affect the nervous system of dogs. It is advisable to prevent them from consuming unripe tomatoes.


Like for humans, some mushrooms can be poisonous to dogs. Accurate identification is crucial, as some are harmless while others can cause serious problems.

Seeds and "Bones" of Fruits

Although fruits are a healthy choice, seeds and bones may contain small amounts of cyanide, a dangerous substance for dogs. Always remove these parts before sharing fruits with your pet.


Raw yeast dough can expand in the stomach of dogs, causing discomfort and digestive issues. It is important to prevent them from consuming raw bakery products.


Contrary to popular belief, bones can pose a risk of choking, splintering, or intestinal obstruction in dogs. Avoid giving them bones, especially cooked ones, which can easily splinter.

Raw Fish

Raw fish may contain parasites that affect dogs. Always cook fish before sharing it with your pet to avoid health risks.

Caffeine or Theine

Substances like caffeine and theine, found in coffee and tea, can stimulate the nervous system of dogs, causing nervousness and, in severe cases, seizures.


Some treats intended for humans may contain ingredients harmful to dogs, such as xylitol, a sweetener that can be toxic.

Difficult-to-Digest Foods for Dogs: Challenges in the Digestive Process

In addition to clearly dangerous foods, there are those that, while not toxic, can be difficult to digest for our canine companions. These foods can trigger vomiting, diarrhea, and various gastrointestinal disorders. Here are some examples:

Excessive Fats (e.g., bacon)

Excessive fats can cause gastrointestinal problems in dogs, including pancreatitis. It is best to limit their consumption of fatty foods.

Dairy (cheese, milk, yogurt)

Although many dogs enjoy the taste of dairy, their digestive system may struggle to process lactose, resulting in stomach discomfort.

Cat Food

Cat food often has a high protein content, which can be harmful to dogs' kidneys if consumed continuously.


Nuts, rich in fats, can be difficult to digest for dogs and, in some cases, can cause gastrointestinal problems.

By understanding the complexity of the canine diet, we can make informed decisions that promote the health and well-being of our beloved furry friends.

Imagen del autor

Alberto Pardal, As an expert in the dog world, I provide valuable information about dog breeds. With years of experience, I offer informative articles to help owners better understand their pets and promote a healthy bond