Your dog can’t tell you when he’s becoming overheated, so it’s up to you to keep an outdoor romp from turning into a dangerous medical situation.

It always amazes me when, every year as the temperatures rise, there are still reports of animals being left alone inside hot vehicles, despite the fact that the dangers of doing so are well-known. Animals that exercise too vigorously in the heat or cannot seek relief from it are also at risk for illness and injury as well. Not too long ago, I had a concerning experience like this with my own dog when I took him out for a little fun in the dog park.That’s why, as the dog days of summer arrive, I thought it might be helpful to review some simple facts about how the heat can affect our pets.

Balmy Weather? Still Deadly

It’s important to realize that dogs and cats can develop heat-related injury quickly when they stay inside a parked car or other vehicle. This can happen even when the windows are partially lowered, the vehicle is in the shade, or the outside temperatures seem relatively moderate. Many people do not realize just how quickly the interior temperature of a car can increase to deadly levels, even with some airflow provided by cracked windows. For example, on a 90-degree day, the temperature inside a closed car can climb to 109 degrees within just 10 minutes. In less than 50 minutes, temperatures in that same car can rise to above 130 degrees. On even a comparatively balmy 70-degree day, temperatures inside a vehicle can reach triple digits within 30 minutes (see table).

Heat toxicity can also occur in dogs that exercise too vigorously during periods of high heat, especially if the humidity is also elevated. Even dogs that are in good athletic shape and used to regular exercise can develop heat injury when out and about in extreme conditions. Heat toxicity, or heat injury, can run the gamut from heat exhaustion (which occurs in the early stages of a heat-related event) to heat stroke, which is a full-blown emergency that requires immediate veterinary intervention.

This chart was originally published in the journal Pediatrics. It also appears on the American Veterinary Medical Association site page about pet safety in cars. To better understand the factors that can cause a car’s interior temperature to skyrocket even when it is cool outside,read this article by Jan Null, CCM.

What Happens to a Heat-Stressed Pet?

During heat stress, the animal’s internal body temperature can increase rapidly, and fatal organ failure can follow. Since dogs and cats do not sweat (except on footpads and the nose) the way humans do, they cannot use this as a method to lower body temperature. Instead, dogs and cats try to regulate their body temperature by panting to help body heat dissipate. This response, however, is limited and easily overwhelmed under extreme conditions.

Signs of Heat Stress

• Initial signs of heat toxicity include:
• Panting
• Excessive salivation (which is often thick and ropey)
• Weakness
• Collapse
• Bright red membranes of the mouth, tongue, eyes, and sometimes skin in light-pigmented dogs
• Vomiting and diarrhea can also occur due to damage to the gastrointestinal tract

Multiple organs can fail if the excessive heat retention is not relieved soon enough. These organs include the gastrointestinal tract, kidneys, liver, heart, muscles, brain, and bone marrow. Heat retention causes the blood vessels to dilate, and a form of shock develops as the condition advances.

If the animal is in a state of collapse when found, it is imperative to get him to your local veterinarian or an emergency clinic immediately. Quickly cooling the animal for the trip with cool water from a garden hose may be helpful but do not immerse your dog in cold or ice water as this could lead to shock. If shock does develop, intravenous fluids and other medications may be needed for a few days upon arrival at the hospital.

Reading nutrition labels is important when choosing dog food. 

The dog food nutrition label, like the nutrition facts box on packaged foods for people, is designed to help you compare products and to learn more about the food. But it can be a bit hard to decipher. We’ve put together a guide to the label to help you understand how to use it.

1. How do I read the dog food ingredient list?

Like packaged food for people, pet food must list ingredients by weight, starting with the heaviest. But if the first ingredient is a type of meat, keep in mind that meat is about 75% water, according to the FDA.

Without that water weight, the meat probably would fall lower on the ingredient list.

Meat meals, such as chicken meal or meat and bone meal, are different; most of the water and fat have been removed, which concentrates the animal protein.
2. What are byproducts, and should I avoid dog foods that contain them?

Veterinarians say that’s a matter of personal choice. Any pet food labeled as “complete and balanced” should meet your dog’s nutritional needs.

Liver, which is a byproduct, is rich in nutrients such as vitamin A. Meat byproducts also can contain blood, bone, brains, stomachs, udders, and cleaned intestines, according to the Association of American Feed Control Officials. Byproducts don’t include hair, horns, teeth, and hooves, although an exception is allowed for amounts that occur unavoidably during processing.

Meat meal also may contain animal parts that many people consider to be byproducts. An ingredient listed as “chicken” or “beef” may include the heart, esophagus, tongue, and diaphragm. Although all these ingredients may sound unpalatable to you, your dog would probably disagree. So don’t necessarily balk if you see byproducts in the ingredients list.

Federal rules to guard against the spread of bovine spongiform encephalopathy (mad cow disease) ban some previously allowed cattle and buffalo parts in animal feed, including pet food. The FDA rule bans the inclusion of body parts from any animal that has tested positive for mad cow disease, as well as brains and spinal cords from older animals, as these are considered to be at higher risk of the disease.

3. What are all those chemical-sounding names lower on the ingredient list?

Preservatives, artificial colors, and stabilizers in pet food must be either approved by the FDA or be generally recognized as safe, a category that includes everything from high fructose corn syrup to benzoyl peroxide, used to bleach flours and cheese. Manufacturers must list the preservatives they add, but they do not always list preservatives in ingredients such as fish meal or chicken that are processed elsewhere.

Some pet owners don’t want to buy food that contains the synthetic preservatives BHA (butylated hydroxyanisole), BHT (butylated hydroxytoluene), or ethoxyquin. These preservatives stop fats from turning rancid and can keep dry dog food fresh for about a year, but their safety has been questioned by some consumers and scientists. But the FDA says they’re safe at the level used in dog food.

“There is a debate about whether there is a need to avoid artificial ingredients like these, as conventional safety testing says they’re fine,” says Susan Wynn, DVM, AHG, a nutritionist for Georgia Veterinary Specialists in the Atlanta area and a clinical resident in small animal nutrition with the University of Tennessee College of Veterinary Medicine. “I wouldn’t want them in my diet every day though, and I try to avoid them in my dog’s daily diet.”

Ethoxyquin came under scrutiny in the 1990s after complaints of skin allergies, reproductive problems, cancer, and organ failure in some dogs given food with this preservative. In 1997, the FDA asked dog food makers to halve the maximum allowed amount of ethoxyquin after tests conducted by manufacturer Monsanto Company showed possible liver damage in dogs fed high levels of the preservative.

Some manufacturers no longer use ethoxyquin, BHA, or BHT, instead using natural preservatives such as vitamin E (mixed tocopherols), vitamin C (ascorbic acid), and extracts of various plants, such as rosemary. Those also keep food fresh, but for a shorter period. Be sure to check a food’s “best by” date on the label before buying or feeding it to your pet.
“If you want shelf life, it’s better to have chemical preservatives,” says Joseph Wakshlag, DVM, PhD, assistant professor of clinical nutrition at Cornell University College of Veterinary Medicine. “They’re added at amounts that won’t harm the dog, and it creates a more stable fat. Rancid fat can cause liver enzymes to go up, and diarrhea.”

4. How can I make sure the food meets my dog’s needs?

Look for a statement of nutritional adequacy on the label.

Many pet food makers follow model regulations set by the Association of American Feed Control Officials (AAFCO) that establish the minimum amount of nutrients needed to provide a complete and balanced diet. The statement may say the food is formulated to meet AAFCO standards or that it has been tested in feeding trials and found to provide complete nutrition.

The AAFCO statement also should say what life stage the food is appropriate for. For puppies, look for a food suitable for growth or all life stages. For adult dogs, look for adult maintenance or all life stages. Nutritional needs for senior dogs can vary, depending on health conditions, and there is no AAFCO standard for senior food.

5. What is the guaranteed analysis?

All dog food labels must list the minimum amount of protein and fat in the food and the maximum percentage of fiber and moisture.
Some dog food labels also list the percentage of other ingredients, such as calcium and phosphorous.

Low-fat dog foods often contain less fat and more fiber, to fill up a dog without adding calories.

At least 10% of the daily diet, by weight, should be protein, and 5.5% should be fat, according to the National Research Council, a scientific research unit of the nonprofit National Academies. Dog foods typically contain higher amounts than those, because dogs may not be able to digest all of the nutrients in a food.

6. What do “natural” and “holistic” labels mean?

Legally, not much. Food labeled as natural should contain few, if any, synthetic ingredients. Holistic, along with premium and super-premium, are marketing terms and there is no rule that controls how they’re used. Watch out for marketing terms like “human-grade ingredients” or “made in a USDA-inspected facility,” too.

“It’s difficult to confirm those claims are truly accurate,” says Teresa Crenshaw, interim chair of AAFCO’s pet food committee. Although pet food can be made in a USDA-inspected plant, it may happen when there is no inspector present, Crenshaw says. Meat once considered safe for humans may have spoiled and been diverted to pet food, she says. Neither claim means the food is safe for humans to eat.

7. What is organic pet food?

There is no official definition for it. But the U.S. Department of Agriculture’s National Organic Program, which sets rules for using an “organic” label, is reviewing the issue.

By Elizabeth Lee
WebMD Pet Health Feature Reviewed by Audrey Cook, BVM&S

Pet owners who are serious about pet-proofing their home should start with their own medicine cabinet. Nearly 50% of all calls received by Pet Poison Helpline involve human medications – both over-the-counter and prescription. Whether Fido accidentally chewed into a pill bottle or a well-intentioned pet owner accidently switched medication (giving their pet a human medication), pet poisonings due to human medications are common and can be very serious.

Below is a list of the top 10 human medications most frequently ingested by pets, along with some tips from the veterinarians at Pet Poison Helpline on how to prevent pet poisoning from human medications.

NSAIDs (e.g. Advil, Aleve and Motrin)

Topping our Top 10 list are common household medications called non-steroidal anti-inflammatories (NSAIDs), which include common names such as ibuprofen (e.g., Advil and some types of Motrin) and naproxen (Aleve). While these medications are safe for people, even one or two pills can cause serious harm to a pet. Dogs, cats, birds and other small mammals (ferrets, gerbils and hamsters) may develop serious stomach and intestinal ulcers as well as kidney failure.

Acetaminophen (e.g. Tylenol)

When it comes to pain medications, acetaminophen (e.g. Tylenol) is certainly popular. Even though this drug is very safe, even for children, this is not true for pets—especially cats. One regular strength tablet of acetaminophen may cause damage to a cat’s red blood cells, limiting their ability to carry oxygen. In dogs, acetaminophen leads to liver failure and, in large doses, red blood cell damage.

Antidepressants (e.g. Effexor, Cymbalta, Prozac, Lexapro)

While these antidepressant drugs are occasionally used in pets, overdoses can lead to serious neurological problems such as sedation, incoordination, tremors and seizures. Some antidepressants also have a stimulant effect leading to a dangerously elevated heart rate, blood pressure and body temperature. Pets, especially cats, seem to enjoy the taste of Effexor and often eat the entire pill. Unfortunately, just one pill can cause serious poisoning.

ADD/ADHD medications (e.g. Concerta, Adderall, Ritalin)

Medications used to treat Attention Deficit Disorder/Attention Deficit Hyperactivity Disorder contain potent stimulants such as amphetamines and methylphenidate. Even minimal ingestions of these medications by pets can cause life-threatening tremors, seizures, elevated body temperatures and heart problems.

Benzodiazepines and sleep aids (e.g. Xanax, Klonopin, Ambien, Lunesta)

These medications are designed to reduce anxiety and help people sleep better. However, in pets, they may have the opposite effect. About half of the dogs who ingest sleep aids become agitated instead of sedate. In addition, these drugs may cause severe lethargy, incoordination (including walking “drunk”), and slowed breathing in pets. In cats, some forms of benzodiazepines can cause liver failure when ingested.

Birth control (e.g. estrogen, estradiol, progesterone)

Birth control pills often come in packages that dogs find irresistible. Thankfully, small ingestions of these medications typically do not cause trouble. However, large ingestions of estrogen and estradiol can cause bone marrow suppression, particularly in birds. Additionally, female pets that are intact (not spayed), are at an increased risk of side effects from estrogen poisoning.

ACE Inhibitors (e.g. Zestril, Altace)

Angiotensin-converting enzyme (or “ACE”) inhibitors are commonly used to treat high blood pressure in people and, occasionally, pets. Though overdoses can cause low blood pressure, dizziness and weakness, this category of medication is typically quite safe. Pets ingesting small amounts of this medication can potentially be monitored at home, unless they have kidney failure or heart disease. All heart medications should be kept out of reach of pets.

Beta-blockers (e.g. Tenormin, Toprol, Coreg)

Beta-blockers are also used to treat high blood pressure but, unlike the ACE inhibitor, small ingestions of these drugs may cause serious poisoning in pets. Overdoses can cause life-threatening decreases in blood pressure and a very slow heart rate.

Thyroid hormones (e.g. Armour desiccated thyroid, Synthroid)

Pets — especially dogs — get underactive thyroids too. Interestingly, the dose of thyroid hormone needed to treat dogs is much higher than a person’s dose. Therefore, if dogs accidentally get into thyroid hormones at home, it rarely results in problems. However, large acute overdoses in cats and dogs can cause muscle tremors, nervousness, panting, a rapid heart rate and aggression.

Cholesterol lowering agents (e.g. Lipitor, Zocor, Crestor)

These popular medications, often called “statins,” are commonly used in the United States. While pets do not typically get high cholesterol, they may still get into the pill bottle. Thankfully, most “statin” ingestions only cause mild vomiting or diarrhea. Serious side effects from these drugs come with long-term use, not one-time ingestions.