Pet Food: Best Choices for Pets (& the Planet)

For some time I've been wanting to write a post about pet food, a $30 billion industry in the United States with many of the same problems as our human food system in its dependence on processed food made from corn, soy and grains—most genetically modified, requiring the use of pesticides and herbicides to grow them. With statistics on the incidence of cancer in pets reaching an alarming 50 percent, it is an appropriate discussion to have. This post from owner Christine Mallar of Green Dog Pet Supply sums up many of my own concerns about this industry, and it is posted here with her permission.

You may have heard something online or from your vet about the issue of dogs eating grain-free foods sometimes showing low levels of taurine in their bloodwork. At Green Dog, we’ve had a number of customers who have said that their vet told them to switch to a food containing grains. One local vet in our area just sent out an email about "Heart Disease and Grain-Free Foods," and also advocating the use of "meat by-products" in pet foods, and we’d like to address both of these topics to help you learn more and make educated decisions.

Grain-Free vs. Grain-Friendly Diets

The truth is, all processed dry pet food diets are compromised nutritionally due to high-heat, high-pressure extrusion and the need for starchy carbs to bind them and make those little crunchy nuggets. Critical amino acids like taurine that are found in muscle meats and organs are fragile and very heat sensitive, and so become damaged by processing. Another variable that might exacerbate these diet-related heart problems could very well be the overuse of legumes in dog foods. Some brands use a lot of them because they contain plant proteins that are less expensive than meat proteins, but plant proteins don’t contain those vital amino acids. Large quantities of peas may very well be blocking absorption of those important amino acids found in meat that do vital jobs in your dog’s body like support its heart function. (Article on health problems associated with grain-free pet food.)

One thing that frustrates us is that many traditional vets work closely with brands like Purina and Hills, companies that are eager to use this opportunity to switch nervous consumers back to their formulas that contain corn, wheat, and soy. Some of these well-intentioned vets are simply advising customers to switch to any food containing grains. Please note that foods made with grains also are using plant proteins to save the company money by taking the place of more species-appropriate proteins from meat, and these plant proteins also do not contain those valuable amino acids like taurine, just like in grain-free foods.

Both corn and wheat are high-carbohydrate and high-glycemic ingredients and can also cause food sensitivities and allergic reactions in dogs. We often see dogs with new troubles come to us after having been on a diet like this, and we are able to reverse these new issues when we remove the foods that contain corn, wheat, and soy and switch to kibbles that have higher quality sources of meat proteins.

More importantly, ingredients such as corn, wheat and soy are likely to contain contaminants that don’t cook out.

Glyphosate and Aflatoxins in Pet Food

Genetically modified (GM or GMO) crops are sprayed with large quantities of Roundup—its active ingredient is glyphosate [which in two recent trials was found to have caused cancer in the (human) plaintiffs]—with corn being especially problematic as it almost certainly contains dangerous [and carcinogenic] aflatoxins. These are dangerous grain molds, toxic to humans and animals, even in very small amounts. The most recent stats from 2017  show that 88 percent of all corn tested nationally was contaminated with aflatoxins, and in some previous years (2012) it was 100 percent contaminated. A testing agency stated: "With more than ten years of experience monitoring the occurrence of mycotoxins in livestock feeds, [animal nutrition company] BIOMIN has shown that co-occurrence of mycotoxins (the presence of more than one mycotoxin) is the rule and not the exception." The FDA allows mycotoxins to be at 20 parts per billion (ppb) in pet foods, however, studies show that even small amounts of mycotoxins can be dangerous to pets. From the International Journal of Food Microbiology, Drs. Herman J. Boermans and Maxwell C. K. Leung published the report “Mycotoxins and the Pet Food Industry: Toxicological evidence and risk assessment” in 2007. One of the biggest issues of concern discussed is that existing studies of mycotoxin contamination in pet food overlook the day-to-day consumption of small amounts of mycotoxins; resulting in “chronic diseases such as liver and kidney fibrosis, infections resulting from immunosuppression and cancer.” In 2005 a Diamond Foods aflatoxin recall resulted in 100 dog deaths.

We don’t have a problem with some grains in foods, and at Green Dog we carry a few lines that have ingredients like oats and barley and rice. All of the kibbles we carry generally have a high percentage of their protein content derived from muscle meats and organs and not plant proteins (even the ones that use some peas). However, you don’t have to run to a food containing grains.* The amino acids in all extruded kibbles suffer damage from heat processing. Ask your pet food store what percentage of your pet food’s guaranteed analysis of protein is derived from meat proteins (as opposed to plant proteins). If it doesn't have that information available, you can:

1. Call the pet food company and ask this question. If they won’t tell you, consider switching brands.
2. Look for a baked kibble (as opposed to extruded) as more of the amino acids survive baking intact. Stella and Chewy’s is one baked kibble we carry.
3. No matter what, consider adding some fresh taurine-rich foods to your pet’s dry food. It’s easy, can be inexpensive, and your pet will love it! See here for suggestions.

Re: Meat By-Products

One thing we take issue with is the statement that "meat by-products” get a bad rap and are actually just good organ meats. Organ meats are desirable ingredients, and are far more expensive than what are generally termed meat by-products. Good organ meats would be listed on the label as their own named ingredient, i.e. “beef liver” or “beef hearts," etc., and would be USDA-inspected and passed for human consumption.

When you look closely at FDA regulations concerning pet food ingredients, meat by-products are defined as rendered product that is legally allowed to be a mix of any species of animal, including animals that “died otherwise than by slaughter." These include animals that died from disease, euthanized animals, condemned or spoiled meats, and roadkill. Rendering facilities are waste management facilities, with separate standards for handling and storing ingredients meant to be rendered. The FDA states clearly that these ingredients are acceptable in pet foods. When looking at your ingredient list, it’s important that you see the species of animal mentioned with the proteins and the fat, i.e. avoid “animal fat” and choose “chicken fat."

At Green Dog, we love human-quality organ meats for pets, and strongly advocate for their use to help supplement naturally occurring amino acids like taurine, cystein and methionine that support heart function, but we avoid by-products in pet foods, as even named ingredients such as “chicken by-products” are not handled with the same safety or quality standards as USDA-inspected and passed meats and organs.

Final Thoughts

It’s true that in a recent update the FDA says that between Jan. 1, 2014, and Nov. 30, 2018, it’s received reports of 325 dogs and 10 cats diagnosed with Dilated Cardiomyopathy (DCM). Most were eating grain-free kibble, but some were on kibble with grains, vegan diets, and some homemade diets. The figures include 74 dogs and two cats which had died. At the same time, as the FDA notes, diet-associated reports of DCM have affected a very small proportion of the estimated 77 million pet dogs in the country. In the update on its investigation, the FDA said that "tens of millions of dogs have been eating dog food without developing DCM" and “based on the data collected and analyzed thus far, the agency believes that the potential association between diet and DCM is a complex scientific issue that may involve multiple factors."

* An editorial note from Kathleen: I feed my two older dogs a diet of raw whole-body chicken—Mary's free-range chicken from Sheridan Fruit Co. that includes organ meat, finely ground bone and cartilage—and ground, blanched vegetables, plus yogurt and homemade bone broth.