Check products or plants that are poisonous to dogs and cats:
http://www.aspca.org/pet-care/poison-control/

Get help fast:
Pet Poison Help Line, at 1-800-213-6680, which I think the emergency vets here recommended over the phone. They do charge for calls, but it is not a lot, maybe $30 or so, which is not much for peace of mind.

American Poison Control: need help now? Call the Poison Help line at 1-800-222-1222 or visit https://www.poisonhelp.org/help

Poison Control Center at (888) 426-4435. http://www.aspca.org/pet-care/poison-control/
They also have an extensive list of poisonous plants, information on recalled pet foods, and you can order a pet rescue window decal alerts rescue personnel that pets are inside your home.

Products poisonous to your dog:
Chocolate, Coffee, Caffeine:
These products all contain substances called methylxanthines, which are found in cacao seeds, the fruit of the plant used to make coffee and in the nuts of an extract used in some sodas. When ingested by pets, methylxanthines can cause vomiting and diarrhea, panting, excessive thirst and urination, hyperactivity, abnormal heart rhythm, tremors, seizures and even death. Note that darker chocolate is more dangerous than milk chocolate. White chocolate has the lowest level of methylxanthines, while baking chocolate contains the highest.

Alcohol:
Alcoholic beverages and food products containing alcohol can cause vomiting, diarrhea, decreased coordination, central nervous system depression, difficulty breathing, tremors, abnormal blood acidity, coma and even death.

Avocado:
The leaves, fruit, seeds and bark of avocados contain Persin, which can cause vomiting and diarrhea in dogs. Birds and rodents are especially sensitive to avocado poisoning, and can develop congestion, difficulty breathing and fluid accumulation around the heart. Some ingestions may even be fatal.

Macadamia Nuts:
Macadamia nuts are commonly used in many cookies and candies. However, they can cause problems for your canine companion. These nuts have caused weakness, depression, vomiting, tremors and hyperthermia in dogs. Signs usually appear within 12 hours of ingestion and last approximately 12 to 48 hours.

Grapes & Raisins:
Although the toxic substance within grapes and raisins is unknown, these fruits can cause kidney failure. In pets who already have certain health problems, signs may be more dramatic. genetically predisposed dogs/cats, can cause kidney failure. There are a lot of dogs who’ve eaten a large number w/ no untoward effects. In some dogs, as few as 7 raisons/grapes can be fatal.

Yeast Dough:
Yeast dough can rise and cause gas to accumulate in your pet’s digestive system. This can be painful and can cause the stomach or intestines to rupture. Because the risk diminishes after the dough is cooked and the yeast has fully risen, pets can have small bits of bread as treats. However, these treats should not constitute more than 5 percent to 10 percent of your pet’s daily caloric intake.

Raw/Undercooked Meat, Eggs and Bones:
Raw meat and raw eggs can contain bacteria such as Salmonella and E. coli that can be harmful to pets. In addition, raw eggs contain an enzyme called avidin that decreases the absorption of biotin (a B vitamin), which can lead to skin and coat problems. Feeding your pet raw bones may seem like a natural and healthy option that might occur if your pet lived in the wild. However, this can be very dangerous for a domestic pet, who might choke on bones, or sustain a grave injury should the bone splinter and become lodged in or puncture your pet’s digestive tract.

Xylitol:

CRITICAL:  This is a big one. As little as 1 pack of gum can cause hypoglycemia and/or liver failure in a 4 1.2 pound dog.

Xylitol is used as a sweetener in many products, including gum, candy, baked goods and toothpaste. It can cause insulin release in most species, which can lead to liver failure. The increase in insulin leads to hypoglycemia (lowered sugar levels). Initial signs of toxicosis include vomiting, lethargy and loss of coordination. Signs can progress to recumbancy and seizures. Elevated liver enzymes and liver failure can be seen within a few days. [SOME GUM BRANDS ARE Epic Xylitol, Xponent ,ElimiTaste Zapp, Spry Xylitol Gum, Trident, Stride, Dentyne Ice, Orbit, etc.]. THERE ARE ALSO XYLITOL CANDIES].

Here is some info from VIN – Two Deadly Effects of Xylitol:
Hypoglycemia
In the canine body, the pancreas confuses xylitol with real sugar and releases insulin to store the “sugar.” The problem is that xylitol does not offer the extra Calories of sugar and the rush of insulin only serves to remove the real sugar from the circulation.=20Blood sugar levels plummet resulting in weakness, disorientation, tremors, and potentially seizures. It does not take many sticks of gum to poison a dog, especially a small dog (see below for toxic doses). Symptoms typically begin within 30 minutes and can last for more than 12 hours. Vomiting and diarrhea may also occur.

Hepatic Necrosis
The other reaction associated with xylitol in the canine body is actual destruction of liver tissue. How this happens remains unknown but the doses of xylitol required to produce this effect are much higher than the hypoglycemic doses described above. Signs take longer to show up (typically 8-12 hours) and surprisingly not all dogs that experience hepatic necrosis, will have experienced hypoglycemia first. A lucky dog experiences only temporary illness but alternatively, a complete and acute liver failure can result with death following. Internal hemorrhage and inability of blood to clot is commonly involved.

Onions, Garlic, Chives:
These vegetables and herbs can cause gastrointestinal irritation and could lead to red blood cell damage. Although cats are more susceptible, dogs are also at risk if a large enough amount is consumed. Toxicity is normally diagnosed through history, clinical signs and microscopic confirmation of Heinz bodies. An occasional low dose, such as what might be found in pet foods or treats, likely will not cause a problem, but we recommend that you do NOT give your pets large quantities of these foods.

Milk:
Because pets do not possess significant amounts of lactase (the enzyme that breaks down lactose in milk), milk and other milk-based products cause them diarrhea or other digestive upset.

NOTE: This is not so much a poison as something that your pet may not be able to tolerate. From  Dr. Kathy

Salt:
Large amounts of salt can produce excessive thirst and urination, or even sodium ion poisoning in pets. Signs that your pet may have eaten too many salty foods include vomiting, diarrhea, depression, tremors, elevated body temperature, seizures and even death. In other words, keep those salty chips to yourself!

Top 10 animal poisonings from 2008 from Animal Poison Control Center:
Human Medications:
For several years, human medications have been number one on the ASPCA’s list of common hazards, and 2008 was no exception. Last year, the ASPCA managed more than 50,000 calls involving prescription and over-the-counter drugs, such as painkillers, cold medications, antidepressants and dietary supplements. Pets often snatch pill vials from counters and nightstands or gobble up medications accidentally dropped on the floor, so it’s essential to keep meds tucked away in hard-to-reach cabinets.

Insecticides:
In our effort to battle home invasions of unwelcome pests, we often unwittingly put our pets at risk. In 2008, our=2 0toxicologists fielded more than 31,000 calls related to insecticides. One of the most common incidents involved the misuse of flea and tick products—such as applying the wrong topical treatment to the wrong species. Thus, it’s always important to talk to your pet’s veterinarian before beginning any flea and tick control program.

People Food:
People food like grapes, raisins, avocado and certain citrus fruit can seriously harm our furry friends, and accounted for more than 15,000 cases in 2008. One of the worst offenders—chocolate—contains large amounts of methylxanthines, which, if ingested in significant amounts, can cause vomiting, diarrhea, panting, excessive thirst, urination, hyperactivity, and in severe cases, abnormal heart rhythm, tremors and seizures.

Rodenticides:
Last year, the ASPCA received approximately 8,000 calls about pets who had accidentally ingested rat and mouse poisons. Many baits used to attract rodents contain inactive ingredients that are attractive to pets as well. Depending on the type of rodenticide, ingestions can lead to potentially life-threatening problems for pets, including bleeding, seizures and kidney damage.

Veterinary Medications:
Even though veterinary medications are intended for pets, they’re often misapplied or improperly dispensed by well-meaning pet parents. In 2008, the ASPCA managed nearly 8,000 cases involving animal-related preparations such as non-steroidal anti-inflammatory20drugs, heartworm preventatives, de-wormers, antibiotics, vaccines and nutritional supplements.

Plants:
Common houseplants were the subject of nearly 8,000 calls to the Animal Poison Control Center in 2008. Varieties such as azalea, rhododendron, sago palm, lilies, kalanchoe and schefflera are often found in homes and can be harmful to pets. Lilies are especially toxic to cats, and can cause life-threatening kidney failure even in small amounts.

Chemical Hazards:
In 2008, the Animal Poison Control Center handled approximately 5,500 cases of pet exposure to chemical hazards. A category on the rise, chemical hazards—found in ethylene glycol antifreeze, paint thinner, drain cleaners and pool/spa chemicals—form a substantial danger to pets. Substances in this group can cause gastrointestinal upset, depression, respiratory difficulties and chemical burns.

Household Cleaners:
Everybody knows that household cleaning supplies can be toxic to adults and children, but few take precautions to protect their pets from common agents such as bleaches, detergents and disinfectants. Last year, the ASPCA received more than 3,200 calls related to household cleaners. These products, when inhaled by our furry friends, can cause serious gastrointestinal distress and irritation to the respiratory tract.

Heavy Metals:
It’s not too much loud music that constitutes our next pet poison offender. Instead, it’s heavy metals such as lead, zinc and mercury, which accounted for more than 3,000 cases of pet poisonings in 2008. Lead is especially pernicious, and pets are exposed to it through many sources, including consumer products, paint chips, linoleum, and lead dust produced when surfaces in older homes are scraped or sanded.

Fertilizer:
It may keep your grass green, but certain types of fertilizer can cause problems for outdoor cats and dogs. Last year, the ASPCA fielded more than 2,000 calls related to fertilizer exposure. Prevention is really key to avoiding accidental exposure, but if you suspect your pet has ingested something lawn-side, please contact your veterinarian or the Animal Poison Control Center’s 24-hour hotline at (888) 426-4435.