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Dangerous Preservatives – Dog, Cat Food and Treats

In this article…
  • Preservatives (used in pet food) that are seriously detrimental to your dog’s, cat’s health – negatively impacting your animal’s quality of life, and shortening life-span; 
  • Uses and dangerous side effects of these chemical-based preservatives.

1.0 Six Chemical-Based Artificial Preservatives You
Need to Get Out of Your Dog’s, Cat’s Diet
  1. BHA;
  2. BHT;
  3. Ethoxyquin;
  4. Sodium Metabisulfite;
  5. Propyl Gallate;
  6. TBHQ
If you are feeding your dog or cat food or treats that include these preservatives – I recommend that you throw the product out and replace it ASAP with a product that is free of these chemicals…
The properties that make these six chemicals ‘good’ preservatives are also responsible for serious health issues in dogs and cats (other animals and humans!)
The seven preservatives noted above are chemical-based preservatives that can be found in many of the dog and cat foods and treats sold in…
  • Veterinarian Offices;
  • Pet Food Stores;
  • Grocery Stores, and;
  • Large Retail Stores such as Walmart.


These preservatives are added to ‘edible’ fats and fat-containing foods to prevent oxidative rancidity of fats and preserve odour, colour and flavour of a product.  

These preservatives are very popular with Dog and Cat Food Companies as these chemical preservatives are:

  • Inexpensive, and;
  • Readily available and thereby enable and support high profit margins.
Do pet food manufacturers have to use these chemical based preservatives?  


But non-organic chemical-based preservatives are considerably cheaper than safe, healthy natural preservatives such as herbs (i.e. rosemary and sage), vitamins (i.e. vitamin E and C). Dehydration is also a way of naturally preserving food (i.e. pure, natural dehydrated chicken jerky), but dehydration reduces the volume of the product – so the manufacturer must either accept a lower profit margin or charge more for the product.
Chemical-based preservatives are of particular importance for companies that use rancid fats – for example pet food companies that purchase previously used fats from restaurants;
  • These fats are cheap and readily available and although not allowed in human grade foods are allowed in pet food;
  • This is also true for rancid meats etc. that cannot be used in human grade food, but are allowable in pet food;
  • When the manufacturer adds chemical–based preservatives such as BHA, BHT etc.:
    • The well-meaning, uninformed loving pet owner won’t smell how rotten the ingredients in the food really are, and;
    • The loving pet owner has no idea that they are exposing their loved pet to a whole host of ailments and an early death.
In the mid 20th century (1950’s) the life-span of companion animals was twice what it is today…before the popularization of processed foods and associated food additives.
2.0 Uses and Dangerous Side Effects 
BHA (Butylated Hydoxyanisole)

is used as a preservative/stabilizer in:
  • Human and Pet Food;
  • Packaging preservative, and;
  • As a yeast de-foaming agent during food manufacturing.
 Examples of Health Issues Caused/Triggered by BHA
  • Adversely effects brain function;
  • Adversely effects behaviour;
  • Allergies;
  • Cancer – Liver and Stomach
  • Cell abnormality;
  • Increased liver weight;
  • As a toxin stored in fat BHA can definitely contribute to the formation of Fatty Tumors;
BHA is a bioaccumulative substance (absorbed by the body at a faster rate than it can be eliminated by the body) – as a result it contributes to ongoing toxic loading of the body.
BHT (Butylated Hydoxytoluene)
BHT is used as a preservative/stabilizer in:
  • Human and Pet Food;
  • Cosmetics;
  • Electronic Transformers;
  • Embalming Fluid;
  • Packaging;
  • Jet Fuel and other engine fuels and oils;
  • Petroleum products;
  • Pesticides;
  • Pharmaceuticals;
  • Rubber;
  • Soaps and detergents.
BHT is a bioaccumulative substance (absorbed by the body at a faster rate than it can be eliminated by the body) – as a result it contributes to ongoing toxic loading of the body.
Examples of Health Issues Caused/Triggered by BHT
  • Biochemical and/or cellular level change…
  • Allergies;
  • Endocrine (hormone) disrupter…
  • Cancer – liver and kidney;
  • Developmental toxicity;
  • Fatty Tumors;
  • Thyroid disrupter.
The other preservatives discussed in this article – if present in a dog or cat food/treat WILL be listed in that food item’s ingredient list.
Ethoxyquin is different than the other preservatives as you will NOT SEE ethoxyquin listed on the ingredients;
The reason for this exclusion from the ingredient list is that ethoxyquin is not added directly to the food or treat;
  • It is instead added to one of the ingredients in the food or treat product – specifically ethoxyquin is the preservative that is added to fish meal.
  • While not all companies use fish meal that contains ethoxyquin – most do! 
  • Ethoxyquin is a lethel pesticide.
Ethoxyquin is an anti-oxidant used as a food preservative and a pesticide (called ‘Stop-Scald’). It is listed and identified as a hazardous chemical by OHSA. It has a rating of 3 on a scale of 1 to 6; with 6 indicating super-toxicity and requiring less than 7 drops to cause death. The containers that Ethoxyquin is stored and shipped in are marked with the word/symbol ‘POISON’. The US Department of Agriculture lists and controls Ethoxyquin as a pesticide.
Examples of Health Issues Caused/Triggered by Ethoxyquin
  • Allergic reactions;
  • Behaviour problems;
  • Bladder cancer, it has also been shown to cause;
  • Cancer of the kidneys;
  • Deformity in puppies;
  • Infertility;
  • Organ failure;
  • Significantly increases the chance of stomach tumors, and;
  • Skin problems.
Ethoxyquin is a bioaccumulative substance (absorbed by the body at a faster rate than it can be eliminated by the body) – as a result it contributes to ongoing toxic loading of the body.
For more on Ethoxyquin – its use and dangers read here.
Sodium Metabisulfite
Is used as a preservative in:
  • Human and Pet Food;
  • Wine;
  • Bleaching agent used in textile, pulp and paper manufacturing;
  • Also used in chemical, film (movie and photographs), pharmaceutical industries and water/sewage treatment.
Examples of Health Issues Caused/Triggered by Sodium Metabisulfite
  • Inhaled:
    • Coughing, shortness of breath;
    • Allergic, asthma-like reaction;
  • Ingested:
    • Abdominal pains;
    • Diarrhea; 
    • Circulatory disturbance;
    • Central nervous system depression;
    • Nausea;
    • Vomiting  
  • Sodium metabisulfite causes extreme allergic reactions in some sulfite-sensitive individuals (human, canine, feline) resulting in broncho-constriction, shortness of breath, wheezing, coughing, GIl disturbances, rapid swelling of the skin, flushing, tingling sensations and shock.
Propyl Gallate
Commonly used in combination with BHA and BHT in the following products:
  • Human and Pet Food;
  • Adhesives;
  • Hair products;
  • Lubricants;
  • Gum and candy, etc.
Examples of Health Issues Caused/Triggered by Propyl Gallate
  • Endocrine (hormone) disrupter…
  • Cancer causing:
  • Thyroid tumors;
  • Brain tumors;
  • Pancreatic tumors;
  • Adrenal tumors;
  • Prostate inflammation.
TBHQ (tertiary butylhydroquinone)
TBHQ  is sometimes combined with BHT, but may also be used alone as a preservative in the following products;
  • Human and Pet food;
  • Cosmetics
  • Skin care products;
  • Lacquers, Resins and Varnish;
  • Explosives.
Examples of Health Issues Caused/Triggered by TBHQ
  • Asthama
  • Cancer (stomach cancer);
  • Cellular level change causing DNA damage;
  • Collapse;
  • Dellerium;
  • Dermatitis;
  • Endocrine disrupter;
  • Hyperactivity;
  • Nausea;
  • Rhinitis;
  • Restlessness;
  • Tinnitus (ringing in the ears);
Legal Cruelty and Abuse
I must admit that I find it strange – we have laws to protect our companion animals from cruelty and abuse perpetrated by an individual, but we allow and pay pet food manufactures to slowly kill our pet companions. 
An illogical situation if it were not for the human condition of greed – which then explains the reason for such extreme lack of ethics and morals as exhibited by the pet food industry. 
Man’kind’ is not.

About Karen Rosenfeld

My name is Karen Rosenfeld. I am an holistic diet nutrition health and wellness practitioner for dogs and cats. I am an holistic behaviorist for dogs. I offer a wealth of real-time, real-life experience. 30 years working and living with dogs and cats. Companion animals are my life, my work, my passion. Maintenance of Health Health Issues and Conditions Custom designed whole food diets, raw and cooked. Recommendations for commercial whole food diets. Consultations available worldwide via FaceTime, FaceBook video and voice, Skype, Phone and email Recommendation and specification of... Species Appropriate: Whole foods Treats Herbs Alternative medicines Supplemental foods Treatment and Remedy Holistic Behaviorist Services for Dogs Include: Obedience Training Behavior Modification Psychological Rehabilitation In-person Sessions Sessions available worldwide via FaceTime, FaceBook video and voice, Skype, Phone Affiliations to Companies None. I don’t sell food or supplements. I am NOT aligned with any companies. I prefer to select best solutions for my individual clients’ situation. My client services are available around the world. 🇺🇸USA 🇨🇦Canada 🇬🇧UK 🇦🇺Australia 🇪🇺Europe 🇨🇷Costa Rica and other Central American Countries 🇦🇪United Arab Emirates 🇸🇪Sweden and other Scandinavian Countries 🇸🇬Singapore and other Countries in Asia etc. Consultations and Sessions 📧Email: karen@ottawavalleydogwhispererer.ca 📞Phone: 1-613-293-3707 📱FaceTime 📱FaceBook video or voice 💻Skype 📖Holistic Wellness eBooks custom designed to suit 🚶In-person Sessions only available in Ontario, Canada.

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  1. We and our pets are consuming chemicals used for RUBBER and EXPLOSIVES?!?!!
    Thank you so much for this article.
    My puppy was eating some of this…
    Also I was wondering if Propylene Glycol is bad for dogs (and/or people)

  2. Highly informative, great article! Thank you so much, people need to see this info!

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