Dogs vs. Chocolate

Many pet owners are aware that chocolate is considered toxic to our pets; however, how much chocolate and how toxic it is are common questions that we in the veterinary profession answer.  Often we hear stories of the family Labrador getting into a whole box of chocolates and suffering no ill effects, so how bad can it be?  The answer lies in understanding the toxic component of chocolate, how the concentration differs depending on the type of chocolate and how the size of animal impacts the risk of toxicity. 

The ingredients of concern in chocolate are theobromine and caffeine.  Theobromine and caffeine belong to a family of compounds called methylxanines.  Methylxanines act as a central nervous system stimulant and cardiovascular stimulant.  Toxic levels of methylxanines cause nausea, vomiting, an increase in blood pressure, increased heart rate, restlessness, hyperactivity, tremors, seizures and possibly even death.  Theobromine is present in much higher amounts than caffeine in chocolate, therefore, it is the theobromine concentration that we consider when determining if chocolate toxicity has occurred.  The concentration of theobromine in chocolate is related to the percentage of cocoa, meaning that unsweetened baker’s chocolate has much more theobromine than a Kinder Surprise milk chocolate egg.  The chart below shows the average amount of theobromine in one gram of various common types of chocolate.

Let’s look at what all of this would mean to a 5kg Miniature Poodle that has just ate a 43g milk chocolate bar versus 43g of unsweetened baker’s chocolate.  In the first scenario signs of toxicity would be very mild and likely consist of nausea and vomiting.  However, the same volume of unsweetened baker’s chocolate would cause severe signs of toxicity including tremors, restlessness, vomiting and possibly seizures.  Conversely a 30kg Labrador Retriever that consumed the same 43g of baker’s chocolate would show little to no signs of intoxication.  How does this apply to your pet?  If your pet has ingested any chocolate it is important to contact your veterinarian.  Provide the veterinarian with the type of chocolate and volume of chocolate consumed, this will help them determine whether or not your pet requires medical attention as well as what level of treatment is required. 

Treatment for chocolate ingestion varies depending on the severity of intoxication.  Most cases of chocolate ingestion involve small quantities of milk chocolate with mild signs of vomiting and nausea.  In cases with mild signs and a small quantity of ingested theobromine, close monitoring is recommended, but no further treatment.   With larger volumes of cocoa ingestion the veterinarian will likely induce vomiting and administer a charcoal compound to decrease the amount of theobromine that enters the blood stream.  A complete blood test may be ran to assess kidney and liver function.  Dogs and cats suffering from toxicity may then be placed on intravenous fluid therapy to help flush their system of theobromine. 

The effects of chocolate vary significantly depending on the size of your pet and the type of chocolate ingested so please be sure to contact your veterinarian during any case of chocolate ingestion.  Remember, even dogs and cats have a sweet tooth, protect your pet by keeping all chocolate in closed cupboard. 

What happens when your cat stops eating? Part 1

Thanks to Dr. Melissa Cirinna for sharing this story of her own cat, Galileo, and his recent health challenge. Our veterinarians approach each case individually, and even when it is their own pet, they often face many of the same challenges to care and diagnosis as with a client's pet. Read on to find out how Dr. Cirinna handled this rather tricky case from her own household.

Galileo

A few weeks ago I received a rather disturbing call from my husband - our cat Galileo would not eat his breakfast.  As a matter of fact he would not even enter the room in which the cats are normally fed.  Knowing Galileo’s love of food, this behavior was very concerning so I had Galileo brought to the clinic for a full examination and bloodwork.  Galileo’s exam showed lethargy and mild dehydration and the results of his bloodwork showed an increase in his calcium levels (hypercalcemia).  The two main causes of hypercalcemia are Inflammatory Bowel Disease and Intestinal Lymphoma.  A definitive diagnosis is made by intestinal biopsy and histopathology.  Treatment for IBD and lymphoma both involve the use of a steroid and an immunosuppressant, and for this reason Galileo was started on treatment immediately rather than pursuing a definitive diagnosis at this point.  Now I could work on encouraging him to eat again.

When cats are ill they will often develop an aversion to their regular food and become anorexic.  The causes for the original aversion can be anything from gastroenteritis (upset stomach), inflammatory bowel disease, pancreatitis (inflammation of the pancreas), stress, liver disease, kidney disease, bladder infection and a multitude of other diseases.  The sheer number of possible differentials makes the anorexic cat a very difficult patient.  To add another level of complexity, the anorexic cat is an urgent case.  Unlike dogs, cats cannot go very long without food.  If a cat is truly anorexic for more than a few days they may begin to develop hepatic lipidosis or fatty liver syndrome.  During anorexia the cat begins to mobilize fat stores which can accumulate in the liver cells.  The accumulation of fat hinders proper function of the liver leading to liver failure and death if the cat does not start eating.  Thankfully, with proper supportive care most cats recover fully from hepatic lipidosis.  Knowing the risk of hepatic lipidosis, I was anxious to get Galileo eating again.  With some anorexic cats, simply changing their food to something more palatable will work and with this in mind we offered Galileo a high energy canned recovery food.  Success!  He readily ate half a can of food while at the clinic, however, we knew we weren’t out of the woods yet.  The real test would be whether he would continue to eat at home.  After 24 hours of intravenous fluids, I was able to take Galileo home to see if his appetite would hold up with the new food.

Stay tuned for Part II as we find out whether Galileo continued to recover at home or needed more veterinary intervention.