As dog owners, it’s no secret that when our furry friend is on their best behavior, sometimes we skip the dog treats and opt for giving them a bit of human food instead. After all, even the best puppy foods can’t curb their cravings for steak, hamburgers, and other delicious foods that we regularly enjoy. However, before throwing your dog a bone—whether literally or figuratively—it’s important to know which human foods you should avoid giving them. Keep reading to learn more about four human foods that are toxic for your furry friend:

1. Chocolate

Starting off with the food most commonly known as toxic for dogs: chocolate! While most of us know and love this food, plenty of us also know that it can be very harmful to our dogs. But why? Well, the theobromine content contained in chocolate is actually the culprit: if your dog ingests enough of it, this can result in an increased heart rate, vomiting, and diarrhea. In severe cases, however, theobromine can cause seizures and death in dogs. The caffeine content in chocolate, too, can be toxic for dogs. Overall, the severity of side effects from chocolate can vary based on the size of your dog—as well as what type of chocolate has been consumed, as the darker and less sweet a chocolate is, the more harmful it is to your furry friend.

2. Onions, chives, and garlic

While not as commonly acknowledged as chocolate, members of the onion family can also be toxic for dogs. Cooked or raw, it’s best to avoid feeding your dog any of these—especially because symptoms may not show up immediately and can actually show up to a few days after consumption. While members of the onion family can cause red blood cell damage, they can also cause gastrointestinal irritation: more specifically, drooling, vomiting, diarrhea, abdominal pain, depression, and a decreased appetite.

3. Grapes and raisins

It’s always safe to stay away from grapes and raisins—even though toxicity may vary from dog to dog—as they have been related to kidney failure in some dogs. Furthermore, diarrhea, lethargy, and vomiting can all occur within the 12 hour window of consumption, which can further result in dehydration, a decreased appetite, and increased—followed by decreased—urination if left untreated. It’s crucial to take your dog to the vet if they’ve ingested a grape or raisin and are experiencing any of the aforementioned symptoms, as death from kidney failure can occur as quickly as three to four days after consumption. In summary, avoid feeding your dog grapes and raisins both on their own and when they’re contained in cereals, biscuits, cakes, and likewise foods.

4. Cooked bones

While some may not be aware, giving a dog cooked bones can be very harmful and sometimes even fatal. Of course, raw bones are fine for dogs—such as the ones available for purchase in various pet shops—but giving your furry friend a cooked bone to chew on is never a good idea. This is because cooked bones are prone to splintering, and can cause constipation—or a fatal perforation of the gut at worst—when consumed in large amounts. Thus, if your dog wants a bone, always make sure that it’s uncooked before giving it to them.