Grapes,

Raisins,

Chocolate,

Garlic!

Garlic isn't as bad in small doses but is still a toxin for dogs including Chihuahuas.

Mary.

(please add some more that I don't know about)

Grapes & Raisins - Grapes and raisins can cause kidney failure in dogs. As little as a single serving of raising can kill a dog.

Onions - Onions can destroy red blood cells and cause anemia.

Chocolate - Can cause seizures, coma, and death. Baker's chocolate is the most dangerous. A dog can consume milk chocolate and appear to be fine because it is not as concentrated, but it is still dangerous.

Coffee, Coffee grounds, Tea, & Tea Bags - Drinks/foods containing caffeine cause many of the same symptoms as chocolate causes.

Macadamia Nuts - Macadamia nuts can cause weakness, muscle tremors, and paralysis. Limit all other nuts as they are not good for dogs in general. Their high phosphorous content is said to possibly lead to bladder stones. Exception to this rule is PEANUTS and PEANUT BUTTER. However, always use salt/sugar free peanut butter.

Peanut Butter - The sugar in peanut butter encourages cancer growth. Always use ORGANIC PEANUT BUTTER as regular peanut butter contains a lot of toxins.

Animal Fat & Fried Foods - Excessive fat can cause pancreatitis.

Bones - Bones can splinter and damage a dog's internal organs.

Tomatoes - Tomatoes can cause tremors and heart arythemias. Tomato plants are the most toxic, but tomatoes themselves are also unsafe.

Avocados - The fruit, pit, and plant are all toxic. They can cause difficulty breathing and fluid accumulation in the chest, abdomen and heart.

Nutmeg - Nutmeg can cause tremors, seizures and death.

Apples, Cherries, Peaches and similar fruit - The seeds of these fruit contain cyanide, which is poisonous to dogs as well as humans. Unlike humans, dogs do not know to stop eating at the core/pit and easily ingest them. It also becomes lodged in the intestines and kills the dog 24 hours with no warning.

Raw Eggs - Raw eggs can cause salmonella poisoning in dogs. Dogs have a shorter digestive tract than humans and are not as likely to suffer from food poisoning, but it's still possible.

Salt - Excessive salt intake can cause kidney problems.

•   Bread Dough- Because it is soft, dogs will often swallow the dough without chewing it. When the dough hits your dog's stomach, his body heat will cause the dough to rise inside his stomach. This rising action can cause bloating or vomiting. To compound things further, the rising action creates alcohol as a by-product, and your dog may experience the symptoms listed in the previous paragraph.
•   Alcoholic Beverages- Dogs' physiologies are not equipped to handle alcohol consumption. They are extremely susceptible to alcohol poisoning, and even small amounts can lead to digestive problems or even death.
•   Caffeinated Beverages-Similar to the effects of chocolate, caffeine is a stimulant and can negatively impact your dog's heart rate, causing seizures or heart attacks.
•   Raw Fish-Raw fish, especially salmon, can contain parasites, usually fluke larvae. The dog consumes the fish, and the larvae hatch in your dog's digestive tract, attaching themselves to his intestinal walls. Symptoms can take up to a week to exhibit and usually mimic other canine diseases, such as distemper or parvovirus. The hazard here is misdiagnosis by the veterinarian, leading to an improper or ineffective treatment. If you choose to feed your dog fish, be sure to cook it thoroughly to kill any bad critters that could be hiding inside.