Xylitol In artificial sweetner  poison to dogs and kills a dog 20 min later.

Chocalate, garlic, alot of plants poison to dogs.

Extremely Toxic (Contains Xylitol/Birch Sugar): Sugar-free gums, mints, candy, some brands of peanut butter, sugar-free baked goods, jellies, pudding snacks, and some medications (especially chewable or liquids).

Mainly the sweetner Xylitol

Sweetner for coffee 

Or flavor drink some have this in it.  Basically ally sugar free most likely has that or similar that not different.

Xylitol is a type of sugar alcohol commonly used as a sugar substitute. Xylitol is found in various products ranging from sugar-free foods like gum, candy, peanut butter and baked goods, but it can also be found in non-food products like toothpaste, medications, lotions, shaving cream and more. The exact amount of xylitol in products varies wildly and can even vary between flavors of the same brand.  

When dogs ingest xylitol, it can kill them.

What food is xylitol found in? 

Other Foods Containing Xylitol

Sweetner for coffee and other foods,

 breath, mints, baked goods, cough syrup, children's and adult chewable  vitamins, mouthwash, toothpaste, some peanut and nut butters, over-the-counter medicines

RAW POTATOES Tomatoes and Raw Potatoes contain a bitter, poisonous alkaloid called Glycoalkaloid Solanine, which can cause violent lower gastronintestinal symptoms.

Chocolate contains theobromine, a compound that is a cardiac stimlant and a diuretic. After a dog has eaten a large quantity of chocolate, owners assume their pet is unaffected. However, the signs of sickness may not be seen for several hours. A dog that has ingested a large quantity of chocolate will exhibit symptoms that include staggering, labored breathing, vomiting, diarrhea, abdominal pain, tremors, fever, heart rate increase, arrhythmia, seizures, coma or death.

Foods Toxic to Dogs

Cocoa powder and cooking chocolate contain ten times more theobromine than milk chocolate. Thus, a chocolate mud cake could be a real health risk for a small dog. Even licking a substantial part of the chocolate icing from a cake can make a dog unwell.

Semi-sweet chocolate and dark chocolate are the next most dangerous forms, with milk chocolate being the least dangerous. Obviously, the smaller the dog, the less it needs to eat.

Onions and Garlic both contain the toxic ingredient thiosulphate. Both can lead to liver failure and death. The poisoning in dogs occurs a few days after the pet has ingested the onion. All forms of onion can be dangerous, including raw, cooked, dehydrated, and table scraps including onion. Pizza, fast foods and commercial baby foods often contain onion, as well as garlic. While garlic also contains the same toxic ingredient, garlic is less toxic.

Mushroom toxicity occurs in dogs and it can be fatal. Amanita phalloides is the most commonly reported severely toxic species of mushroom, but other species are also toxic. Symptoms include abdominal pain, drooling, liver damagae, kidney damage, vomiting diarrhea, convulsions, coma, death.

As few as a handful of raisins or grapes can make a dog ill; however, of the 10 cases reported to the ASPCA Animal Poison Control Center (APCC), each dog ingested between 9 ounces and 2 pounds of grapes or raisins. Symptoms include vomiting, diarrhea, abdominal pain, and lethargy.

Macadamia nuts are another concern, along with most other kinds of nuts. Their high phosphorus content is said to possibly lead to bladder stones. Dogs develop a tremor of the skeletal muscles, and weakness or paralysis of the hindquarters. Affected dogs are often unable to rise and are distressed, usually panting. Some affected dogs have swollen limbs and show pain when the limbs are manipulated. WELL AS THE ROOTS THAT  GROW out the potatoes

OLEANDER TREES  AND MANY MORE.

FLEA SPRAY PERMETHRIN FOR LICE BEST FOR FLEAS. BUT IT IS SO TOXIC AND POSIONIOUS TO CATS AND DOES NOT WARN ON LABEL. THEY HAVE SEIZURES AND THEN DIE. WHILE IT IS NOT TO DOGS.

When in question please google to be sure

THIS IS NOT MEDICAL ADVICE. JUST A TIP FOR ANY THAT DIDNT KNOW.