Toxic Foods for Dogs - 10 Ingredients to Avoid

It's a universal pet owner experience to have your pets watching you as you eat, hovering by your feet at the dinner table and staring longingly at your favourite snack—but don't let their whimpering and pleading eyes sway you. Although human food might seem like a tasty treat, many common household ingredients and foods are highly toxic to dogs. As their guardians, it's essential to understand these dangers and keep them far from their food bowls. Here are 10 food items that are toxic and hazardous to your furry friend.

10 Common Human Foods that are Toxic to Dogs

Dogs are curious creatures, and will often eat any food left within reach. However, many unexpected ingredients can be fatal for dogs, leading to serious health problems and even death.

1. Chocolate

Chocolate is well-known for being toxic to dogs. This is because it contains methylxanthines, specifically caffeine and theobromine, which are poisonous to dogs. If your dog consumes chocolate, it can lead to symptoms such as tremors, vomiting, and diarrhoea, and can lead to potentially fatal heart complications. The severity of the reaction depends on several factors, including:

• Type of chocolate consumed
• Quantity of chocolate ingested
• Size and weight of the dog

For example, a 50g bar of dark chocolate can cause life-threatening toxicity in a small dog. If your pet consumes chocolate, seek veterinary care immediately and bring the chocolate packaging to help your vet assess toxicity levels based on your pet’s weight.

2. Caffeine

Caffeine is a type of methylxanthine found in beverages like coffee, soda, and energy drinks. It may also be found in common household items such as chewing gum, coffee grounds, standard pain medication, or vitamin supplements.

Dogs are also more sensitive to the effects of caffeine than humans. While a cup of coffee can give us a mild buzz, it can be harmful to dogs, causing stomach upset, vomiting, elevated heart rate, and heart arrhythmia.

3. Nuts

Nuts are generally not recommended for dogs due to their high fat content, which can lead to obesity, pancreatitis, and other health issues. Certain nuts, such as macadamia nuts, are highly toxic to dogs, while others, like almonds, pose choking hazards. Salted or seasoned nuts can also cause complications like water retention.

Peanuts (technically legumes) and cashews are considered safe in very small quantities if unsalted and unseasoned. However, their high-fat content makes them unsuitable as regular treats. Always consult your veterinarian if your dog consumes a large quantity of nuts or shows signs of illness.

4. Onions, Garlic & Chives

Vegetables such as onions, garlic, chives, scallions, and shallots, can destroy a dog’s red blood cells. This causes anemia, which leads to a dog’s blood being unable to carry oxygen to its cells. As a result, dogs may become weak, potentially leading to life-threatening complications.

5. Alcohol

Dogs can experience intoxication from alcohol just like humans. Signs of alcohol poisoning include drowsiness, a loss of balance, a decrease in body temperature, low blood sugar, seizures, and falling into a coma. Dog owners should therefore exercise caution to avoid accidentally giving their pets foods or drinks containing alcohol and to ensure that glasses are not left unattended.

6. Artificial Sweeteners (Xylitol)

The artificial sweetener xylitol is found in products such as chewing gum, sweets, baked goods, and even toothpaste (which is why it’s crucial to use dog-specific toothpaste for your pet's oral hygiene!).

Xylitol causes an insulin release in the body, which lowers a dog's blood sugar, leading to hypoglycaemia. It can cause vomiting, lethargy, loss of coordination, and liver failure, with symptoms taking up to eight hours to show up. For the same reasons, you should avoid feeding your dogs candy and other artificially sweetened sugary treats—even small amounts!

7. Grapes & Raisins

While seemingly harmless, grapes can be very dangerous for dogs, especially if they are dried. As such, any grape and raisin products can be fatal for dogs even in small amounts. This includes jellies, jams, fruit preserves, and juices. It is unclear why grapes and raisins are toxic to dogs, but recent studies suggest that tartaric acid, a natural compound in grapes, may be the cause.

If your dog ingests these products, it may lead to stomach upset and kidney damage. Some symptoms are lethargy, vomiting, loss of appetite, and diarrhoea. More severe signs may not be visible until 24-48 hours have passed, and by then, acute kidney damage may have already begun. This makes it crucial to seek out a vet immediately if you suspect they have ingested these fruits.

8. Avocado

Avocado may seem like a safe treat because of its soft, green flesh. However, its leaves, fruit, and seed contain a substance called persin, which can cause gastrointestinal upset, diarrhoea, and vomiting in dogs in large amounts. Due to its high-fat content, ingesting large amounts of avocado can also lead to pancreatitis.

9. Yeast Dough

If ingested, raw bread dough containing yeast can expand and rise in the stomach. This stretches your dog's abdomen, causing bloating, retching, vomiting, and difficulty breathing as it puts pressure on the diaphragm. In severe cases, this condition can lead to collapse and may even be life-threatening.

In addition, when the yeast multiplies, it produces alcohol which may lead to a range of concerning symptoms from drowsiness to seizures, potentially requiring immediate veterinary intervention.

10. Wild Mushrooms

If you bring your dog on a walk in nature, watch out for them consuming fungi growing in the wild. Many wild mushrooms are poisonous and potentially fatal for your dog. Depending on the species of wild mushroom, ingesting them can cause vomiting, diarrhoea, weakness, tremors, and seizures. Its toxins can also affect the organs, leading to kidney injury and liver failure.

Maintaining a Safe Diet for Your Dog

Dogs process certain substances differently from humans and are unable to metabolise many common ingredients, making them more vulnerable to poisoning. It is important to avoid these listed items, while establishing a reliable diet for them. 

As a rule of thumb, excessive amounts of fatty, oily, sugary, salty, or processed food should be avoided. It is also important to know their food allergies. Being well-informed of the ideal diet for a dog can prevent these medical emergencies, and keep your pet healthy, happy, and safe.

Signs of Poisoning in Dogs

Be on the lookout for these symptoms if your dog has ingested toxic food by accident:

• Weakness
• Disorientation
• Vomiting
• Tremors
• Seizures
• Excessive salivation

What Should You Do If Your Dog Eats Something Toxic?

If you notice any symptoms of poisoning, contact a veterinarian immediately and provide details of what your pet has consumed. Emergency care is crucial if they show severe signs such as seizures, difficulty breathing, persistent vomiting or diarrhoea, uncoordinated movements or collapse. Contact us for urgent veterinary assistance, and our team will guide you on the next steps.