Article: Nutrition » Dog Food
Dog food refers to food specifically intended for consumption by dogs, as opposed to table scraps of human food. In the United States alone, dog owners spent over $8.5 billion on commercially manufactured dog food in 2007. Some people make their own dog food, feed their dogs meals made from ingredients purchased in grocery or health-food stores or give their dogs a raw food diet.
Commercial Dog Food
Most store-bought dog food comes in either a dry form (also known in the US as kibble) or a wet canned form. Dry food contains 6-10% moisture by volume, as compared to 60-90% in canned food. Semi-moist foods have a moisture content of 25-35%. Pet owners often prefer dry food for reasons of convenience and price. Although dry food can be left out for long periods of time, pet owners typically portion control and feed their pets fresh food twice a day, as they would with wet food.
Wet Dog Food
Wet or canned dog food is significantly higher in moisture than dry or semi-moist food. Because canned food is commercially sterile (cooked during canning); other wet foods may not be sterile. A given wet food will often be higher in protein or fat compared to a similar kibble on a dry matter basis (a measure which ignores moisture); given the canned food’s high moisture content, however, a larger amount of canned food must be fed. Grain gluten and other protein gels may be used in wet dog food to create artificial meaty chunks, which look like real meat.
Alternative Dog Food
In recent years, new types of dog food have emerged on the market that differ from traditional commercial pet food. Many companies have been successful in targeting niche markets, each with unique characteristics. A non-alcoholic “beer” for dogs (Kwispelbier) is made in the Netherlands from beef extract and malt.
Popular Alternative Dog Food Labels:
- Frozen or Freeze-Dried, comes in raw or cooked (not processed) form. The idea is to skip the processing stage traditional dry/wet dog food goes through. This causes less destruction of the nutritional integrity. To compensate for the short shelf life, products are frozen or freeze-dried.
- Dehydrated, comes in raw and cooked form. Products are usually air dried to reduce moisture to the level where bacterial growths are inhibited. The appearance is very similar to dry kibbles. The typical feeding methods include adding warm water before serving.
- Fresh or Refrigerated, produced through pasteurization of fresh ingredients. Products are lightly cooked and then quickly sealed in a vacuum package. Then they are refrigerated until served. This type of dog food is extremely vulnerable to spoiling if not kept at a cool temperature and has a shelf life of 2–4 months, unopened.
- Homemade Diet often comes in a bucket or Tupperware-like package. In the past this was thought to be a diet that owners create themselves. However, recently, many small companies have begun to home-cook dog dishes and then sell them through specialty stores or over the Internet. Many pet owners feed dogs homemade diets. These diets generally consist of some form of cooked meat or raw meat, ground bone, pureed vegetables, taurine supplements, and other multivitamin supplements. Some pet owners use human vitamin supplements, and others use vitamin supplements specifically engineered for dogs.
- Vegetarian dog foods are manufactured by several companies. They are usually balanced and contain ingredients such as oatmeal, pea protein, and potatoes instead of meat to supply protein. A dog owner may choose to feed a vegetarian food for ethical and/or health reasons, or in cases of extreme food allergies.
Many commercial dog foods are made from materials considered by some authorities and dog owners to be unusable or undesirable. These may include:
- Meat and bone meals
- Offal (wild canines, however, do eat offal as a vital part of their diets)
- Grain byproducts
Less expensive dog foods generally include less meat, and more animal by-products and grain fillers. Proponents of a natural diet criticize the use of such ingredients, and point out that regulations allow for packaging that might lead a consumer to believe that they are buying a natural food, when, in reality, the food might be composed mostly of ingredients such as those listed above. More expensive dog foods may be made of ingredients suitable for organic products or free range meats. Ingredients must be listed by amount in descending order.
According to the Association of American Feed Control Officials (AAFCO), animal by-products in pet food may include parts obtained from any animals who have died from sickness or disease provided they are rendered in accordance to law. As well, cow brains and spinal cords, not allowed for human consumption under federal regulation 21CFR589.2000 due to the possibility of transmission of BSE, are allowed to be included in pet food intended for nonruminant animals. In 2003, the AVMA speculated changes might be made to animal feed regulations to ban materials from “4-D” animals – those who enter the food chain as dead, dying, diseased or disabled.
Raw Dog Food
Supporters of raw feeding believe that the natural diet of an animal in the wild is its most ideal diet and try to mimic a similar diet for their domestic companion. They are commonly opposed to commercial pet foods, which they consider poor substitutes for raw feed. Opponents believe that the risk of food-borne illnesses posed by the handling and feeding of raw meats would outweigh the purported benefits and that no scientific studies have been done to support the numerous beneficial claims. The Food and Drug Administration of the United States states that they do not advocate a raw diet but recommends owners who insist on feeding raw to follow basic hygienic guidelines for handling raw meat to minimize risk to animal and human health.
Many commercial raw pet food manufacturers now utilize a process called High Pressure Pasteurization (HPP) that is a unique process that kills pathogenic bacteria through high-pressure, water-based technology. High Pressure Pasteurization is a USDA-approved, 100% natural process, and is allowed for use on organic and natural products.
Commercial frozen raw dog food is distributed by various independent pet specialty retailers.
Raw foods produced for dogs and sold in pet stores are commercially safer than raw meats purchased in grocery stores. The acceptable level of bacteria in meats sold at grocery stores is relatively high because it is meant to be cooked. The acceptable level of bacteria in produced raw foods for dogs is relatively low because it is meant to be fed raw.
In the United States, dog foods labeled as “complete and balanced” must meet standards established by the Association of American Feed Control Officials (AAFCO) either by meeting a nutrient profile or by passing a feeding trial. The Dog Food Nutrient Profiles were last updated in 1995 by the AAFCO’s Canine Nutrition Expert Subcommittee. The updated profiles replaced the previous recommendations set by the National Research Council (NRC).
Critics argue that due to the limitations of the trial and the gaps in knowledge within animal nutrition science, the term “complete and balanced” is inaccurate and even deceptive. An AAFCO panel expert has stated that “although the AAFCO profiles are better than nothing, they provide false securities.”
Certain manufacturers label their products with terms such as premium, ultra premium, natural and holistic. Such terms currently have no legal definitions. There are also varieties of dog food labeled as “human-grade food”. Although no official definition of this term exists, the assumption is that other brands use foods that would not pass US Food and Drug Administration inspection according to the Pure Food and Drug Act or the Meat Inspection Act.
The ingredients on the label must be listed in descending order by weight before cooking. This means before all of the moisture is removed from the meat, fruits, vegetables and other ingredients used.
The 2007 pet food recalls involved the massive recall of many brands of cat and dog foods beginning in March 2007. The recalls came in response to reports of renal failure in pets consuming mostly wet pet foods made with wheat gluten from a single Chinese company, beginning in February 2007. After more than three weeks of complaints from consumers, the recall began voluntarily with the Canadian company Menu Foods on March 16, 2007, when a company test showed sickness and death in some of the test animals.
Overall, several major companies have recalled more than 100 brands of pet foods, with most of the recalled product coming from Menu Foods. Although there are several theories of the source of the agent causing sickness in affected animals, with extensive government and private testing and forensic research, to date, no definitive cause has been isolated. As of April 10, the most likely cause, according to the FDA, though not yet proven, is indicated by the presence of melamine in wheat gluten in the affected foods.
In the United States, there has been extensive media coverage of the recall. There has been widespread public outrage and calls for government regulation of pet foods, which had previously been self-regulated by pet food manufacturers. The economic impact on the pet food market has been extensive, with Menu Foods losing roughly $30 Million alone from the recall. The events have caused distrust of most processed pet foods in some consumers.
In 1999, another fungal toxin triggered the recall of dry dog food made by Doane Pet Care at one of its plants, including Ol’ Roy, Wal-Mart’s brand, as well as 53 other brands. This time the toxin killed 25 dogs.
A 2005 consumer alert was released for contaminated Diamond Pet Foods for dogs and cats. Over 100 canine deaths and at least one feline fatality have been linked to Diamond Pet Foods contaminated by the potentially deadly toxin, Aflatoxin, according to Cornell University veterinarians.
Dangerous Foods and Toxic Substances
A number of common human foods and household ingestibles are toxic to dogs, including chocolate solids (theobromine poisoning), onion and garlic (thiosulphate, sulfoxide or disulfide poisoning), grapes and raisins, macadamia nuts, as well as various plants and other potentially ingested materials. Green tomatoes should be avoided in a dog’s diet because they contain tomatine, which is harmful to dogs. As the tomato ripens and turns red the tomatine disappears, and the tomato become safe for the dog to eat. The tomato plant itself is toxic.
See Article: Nutrition » Dangerous Foods-Toxic Substances
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- Messonnier, S. (2001) Natural Health Bible for Dogs & Cats. New York: Three Rivers Press. ISBN 0-7615-2673-0
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- Wysong – Companion Animal – Learn – The Pet Food Ingredient Game
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- Sources vary on which of these are considered the most significant toxic item.
- “Toxic Foods and Plants for Dogs”. entirelypets.com.
- Drs. Foster & Smith. “Foods to Avoid Feeding Your Dog”. peteducation.com.
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