Dangerous Foods for Dogs
The foods you give your four-legged friend can be dangerous depending on what it contains. There’s a lot of human food your dog should never eat. Some of these common foods may surprise you.

Avocado
Avocados contain substance something called persin. It’s ok for people who aren’t allergic to it. However, too much might be harmful to dogs. If you grow avocados at home, keep your dog away from the plants. Persin is found in the seed, leaves, and bark, as well as the fruit.

Onions and Garlic
Onions and garlic can kill the red blood cells of your dog, thereby causing anemia. The powdered, cooked raw or dehydrated form of onions and garlic should be kept far away from dogs. Eating the onion powder a lot just once or can cause poisoning. Look for signs like weakness, vomiting, and breathing problems.
Alcohol
Alcohol has the same effect on a dog’s liver and brain that it has on human. But unlike in people, it takes a little quantity to harm your dog. Just a little beer, liquor, wine, or food that contains alcohol can be lethal. It can cause diarrhea, vomiting, coordination problems, coma, breathing problems and even death. The size of your dog matters too because the smaller your dog, the worse it can be.
Coffee, Tea, and Other Caffeine
If you want your dog to be lively, give him toys and not caffeine. Caffeine can be fatal. Watch out for coffee and tea, even the beans and the grounds. Avoid giving your dog chocolate, cocoa, colas and energy drinks. Caffeine is also in some cold medicines and pain killers. Signs to watch out for if your dog had caffeine are fast breathing, restlessness and muscle twitches.

Grapes and Raisins
Grapes and raisins are dangerous for your dog to eat because they can cause kidney failure. Just a little quantity can make a dog sick. Vomiting over and over is an early sign. Your dog will get sluggish and depressed within a day after eating grapes and raisins.

Chocolate
The most unsafe types of chocolate to give your dog are dark chocolate and unsweetened baking chocolate. Chocolate can cause a dog to have heart problems, tremors, seizures including vomiting, diarrhea and even death.

Note: Even white chocolate is still not good for your dog.
Fat Trimmings and Bones
Dogs can develop pancreatitis if they eat fat trimmed from meat – both cooked and uncooked. Though it seems natural to give dogs bone, they can choke on it. Bones can also splinter and block or cause cuts in your dog’s digestive system.

Raw Eggs
There’s the chance of food poisoning from bacteria like salmonella or E. coli if you feed your dog raw diet that includes uncooked eggs.

Salt
Feeding your dog with too much salty foods like chips or pretzels can lead to lead to sodium ion poisoning. Symptoms of too much salt include tremors, depression, vomiting, diarrhea, seizures, high temperature and even death.

Sugary Foods and Drinks
Too much sugar can do the same thing to dogs that it does to human. It can make your dog overweight and cause health issues with her teeth. It can even lead to diabetes.

Your Medicine
Giving your dog medications meant for you can make them very ill. Keep all medicines out of your dog’s reach. And, never give your dog any over-the-counter medicine unless it is recommended by your vet. Ingredients such as acetaminophen or ibuprofen can be deadly for your dog, and they are common in pain relievers and cold medicine.

Milk and Other Dairy Products
You may be tempted to share your ice cream with your dog on a hot day. Instead of ice cream, give her an ice cube. Milk-based products can cause diarrhea and other digestive problems

Source: http://www.healthdiary365.com/2017/12/16/list-of-foods-your-dog-should-never-eat/