Choosing an Omega-3 Oil for Your Pet

January 24, 2014
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You know how important Omega-3 fatty acid supplementation is for dogs and cats. The anti-inflammatory effects of Omega-3s EPA (eicosapentanoic acid) and DHA (docosahexanoic acid) have been thoroughly researched. Omega-3 supplementation has been abundantly proven to be beneficial for dogs and cats for a wide variety of conditions, including chronic kidney disease(1), arthritis(2), allergies(3), and skin and coat problems(4).

But do you know how to choose the best Omega-3 supplement? Let’s look at the main sources of Omega-3s on the market:

Flaxseed/Nut/Vegetable Oils

The vast majority of plant-based oils are in the form of Omega-6 fatty acids, which are already over-supplied in our pets’ diets. Flaxseeds and a few other seeds and nuts also contain the Omega-3 alpha-linolenic acid (ALA). ALA has beneficial effects of its own, particularly on skin and coat health. However, after weaning, dogs and cats (and humans) cannot convert more than 1-2% of it into EPA and none to DHA (the essential fatty acids that are so important to health)(5). Only marine oils contain these particular Omega-3s in a completely bioavailable form.

Algae Oil

Many species of algae naturally produce DHA, but very few produce significant amounts of EPA. Algal oils may also contain Omega-6 fatty acids, which is highly undesirable. While they do provide a choice for vegan individuals, dogs and cats are not (and should not be vegans), and should get their Omega-3s from an animal source.

Fish-Based Oils

Fish and cod liver oil are the most common and popular sources of EPA and DHA. However, these can be surprisingly problematic.

Most salmon oil (and all salmon products from the Atlantic Ocean, Scotland, and Norway) comes primarily from farm-raised salmon. These factory-farmed fish are grown in polluted, overcrowded pens(6); they are heavily vaccinated(7), and fed dyes, antifungals, parasiticides, and antibiotics(8); and they contain up to 10 times more mercury, dioxins, PCBs, and other toxins than wild fish(9,10). Farmed salmon also pose a serious threat to wild species in both Atlantic and Pacific oceans from parasites (11), disease (12), and interbreeding of escaped fish(13). Additionally, about 1/3 of labeled “Alaska,” “wild,” and “wild-caught” salmon are not truly wild, but bred and raised in hatcheries; their release into the ocean is threatening both wild salmon, and other fish(14). Oil from farmed fish also contain less Omega-3s and far more Omega-6s than wild fish(15).

Cod liver oil is commonly supplemented with Vitamins A and D at levels that could easily become toxic in cats and dogs(16). Moreover, a loophole in the law allows non-cod species to be labeled as cod.

Mass-produced, low-priced fish oils usually contain filler oils (such as sunflower, safflower, canola, and olive oil), which add undesirable Omega-6s, and are typically processed with harsh chemicals.

There are also oils made from other fish, such as menhaden (a threatened keystone species, and the source of most unspecified “fish oil”). Sardine, herring, and anchovy oils are, so far, more sustainable and cleaner than most other fish oils. While it’s best to use a product made specifically for pets in order to avoid the additives found in human products, many pet fish oils are quite low in potency, and may not be sufficient for your pet’s needs.

Krill Oil

Krill oil is a non-fish alternative Omega-3 product that is gaining in popularity. Krill (tiny shrimp-like crustaceans), are the keystone species and major food source for many marine animals, including fish, whales, seals, squid, and birds. Krill are utilized for oil, as well as being processed into food for farmed fish. The global biomass of krill is enormous, and krill oil promoters claim that it’s impossible to over-harvest it. On a global scale, that may be true; but the problem is that they are being harvested in and around critical feeding grounds of the animals that eat them. This is already causing local areas of depletion, threatening dozens of species of fish, seabirds, and mammals, including whales, which are already at higher risk from melting ice packs and warming sea temperatures.(17)

Greenlip Mussel Oil

New Zealand greenlip mussels (Perna canaliculus, GLM) are grown under a Sustainable Farming Program that ensures the long term viability of the greenlip mussel industry, with minimum impact on the environment. GLM are bi-valve mollusks with proven value for canine arthritis.(18) GLM provide a rich source of 33 fatty acids, of which 5 are Omega 3s (including essential Omega 3s EPA, DHA, and alpha linolenic acid). One of GLM’s unique array of Omega 3s is ETA (eicosatetraenoic acid). ETA–which is not found in any other food to any measurable degree–has extremely powerful ant-inflammatory properties and is beneficial for the heart(19). GLM oil has less saturated fat, and more mono- and polyunsaturated fats, than fish oil or cod liver oil.

GLM oil has the following fatty acid profile:

(EPA) Eicosapentaenoic C20:5n-3: 4.7%
(DHA) Docosahexaenoic C22:6n-3: 3%
Palmitic C16:0: 14.2%
Myristic C14:0: 0.9%
Myristoleic C14:1: 0.1%
Penadecanoic C15:0: 0.1%
Hexadencenoic C16:1: 2.9%
Magaric C17:0: 0.2%
Heptadecenoic C17:1: 0.1%
Stearic C18:0: 2.5%
Oleic C18:1n-9: 52.8%
Linoleic C18:2n-6: 12.1%
Octadecadienic C18:2: 0.8%
Alpha Linolenic C18:3n-3: 1.0%
Arachidic C20:0: 0.2%
Eicosenic C20:4n-9: 0.7%
Eicosatetraenoic C20:4n-3: 0.1%
Arachidonic C20:4n-6: 0.3%
Heneicosapentaenoic C20:5n-3: 0.1%
Docosanoic C22:0: 0.1%
Docosapentaenoic C22:6n-3: 0.3%
Tetracosanoic C24:0: 0.1%

A company called Moxxor produces an ideal greenlip mussel oil: it is organic; sustainably grown; humanely processed; cold-extracted; and certified to be free of mercury and other toxins and pollutants. It also contains cold-pressed, organic white grape seed husk extract and/or kiwifruit seed oil—these potent oils naturally deactivate free radicals, as well as serving as natural preservatives for the GLM oil.

In contrast to many marine oil products, Moxxor is cold processed. As a result, it contains a higher level of “polar” fatty acid molecules (which readily form bonds with surrounding tissues) than other oils, making Moxxor more bioavailable. This, as well as the absence of fillers or carrier oils, is what allows a very small GLM oil capsule to contain more antioxidant power as the larger Krill oil capsules and gigantic fish oil capsules.

In order to ensure freshness, the mussels grown for Moxxor are processed in a facility built on the shores of the sound where they are grown and harvested. In addition, the other two components of Moxxor, Sauvignon Blanc grape seed husk extract and kiwifruit seed oil provide additional antioxidant power, including all 8 members of the Vitamin E family. These ingredients also safeguard Moxxor’s freshness and stability by scavenging the oxygen free radicals that cause rancidity.

Size comparison of Omega-3 products: Fish Oil (left), Krill Oil (center), and Moxxor (right) 

Moxxor comes in a very small capsule, making it easy to give even to small pets. The photo shows the difference between gigantic fish oil capsules (on the left), krill oil capsules (center), and Moxxor (on the right). Moxxor’s mild taste is well accepted, even by cats and fussy dogs.

For all these reasons, I believe that Moxxor is the ideal Omega-3 fatty acid supplement for pets (and people).

References

(1) Bowden RG, Wilson RL, Deike E, et al. Fish oil supplementation lowers C-reactive protein levels independent of triglyceride reduction in patients with end-stage renal disease. Nutri Clin Pract 2009 Aug-Sep;24(4):501-12.

(2) Roush JK, Dodd CE, Fritsch DA, et al. Multicenter veterinary practice assessment of the effects ofomega-3 fatty acids on osteoarthritis in dogs. J Am Vet Med Assoc. 2010 Jan 1;236(1):59-66.

(3) Abba C, Mussa PP, Vercelli A, Raviri G. Essential fatty acids supplementation in different-stage atopic dogs fed on a controlled diet. J Anim Physiol Anim Nutr (Berl). 2005 Apr-Jun;89(3-6):203-7.

(4) Bauer JE. Responses of dogs to dietary omega-3 fatty acids.  J Am Vet Med Assoc. 2007 Dec 1;231(11):1657-1661.

(5) Dunbar BL, Bigley KE, Bauer JE. Early and sustained enrichment of serum n-3 long chain polyunsaturated fatty acids in dogs fed a flaxseed supplemented diet. Lipids. 2010 Jan;45(1):1-10.

(6) Cole DW, Cole R, Gaydos SJ, et al. Aquaculture: Environmental, toxicological, and health issues. Int J Hyg Environ Health. 2009 Jul;212(4):369-77.

(7) Gudding R, Lillehaug A, Evensen Ø. Recent developments in fish vaccinology. Vet Immunol Immunopathol. 1999 Dec;72(1-2):203-212.

(8) Brocklebank JR, Namdari R, Law FC. An oxytetracycline residue depletion study to assess the physiologically based pharmokinetic (PBPK) model in farmed Atlantic salmon. Can Vet J. 1997 Oct;38:645-6.

(9) Berntssen MH, Maage A, Julshamn K, et al. Carry-over of dietary organochlorine pesticides, PCDD/Fs, PCBs, and brominated flame retardants to Atlantic salmon (Salmo salar L.) fillets. Chemosphere. 2011 Mar;83(2):95-103.

(10) Hites RA. Global Assessment of Organic Contaminants in Farmed Salmon. Science. 2004;303(5655 ):226–229.

(8) Roberge C, Normandeau E, Einum S, et al. Genetic consequences of interbreeding between farmed and wild Atlantic salmon: insights from the transcriptome. Mol Ecol. 2008 Jan;17(1):314-24.

(11) Stokstad E. Parasites from fish farms driving wild fish to extinction. Science. 2007 Dec 14;318(5857):1711.

(13) Krkošek, M., M.A. Lewis, A. Morton, L.N. Frazer, J.P. Volpe. 2006. Epizootics of wild fish induced by farm fish. Proc Nat Acad Sci. 103:15506-15510.

(14) Lackey RT. Restoring wild salmon to the Pacific northwest: chasing an illusion? U.S. Environmental Protection Agency. http://www.epa.gov/wed/pages/staff/lackey/pubs/illusion.htm#N_1_ 

(16) USDA National Nutrient Database for Standard Reference, Release 25. http://www.ars.usda.gov/Services/docs.htm?docid=8964 

(16) National Research Council. Nutrient Requirements of Dogs and Cats . Washington, DC: The National Academies Press, 2006, 194-205.

(17)Schiermeier Q. Ecologists fear Antarctic krill crisis: fishing industry threatens to destabilize stocks. Nature. 2010;467:15.

(18) Bierer TL, Bui LM. Improvement of Arthritic Signs in Dogs Fed Green-Lipped Mussel (Perna canaliculus).  J. Nutr. June 1, 2002 vol. 132 no. 6 1634S-1636S.

(19) Øie E, Ueland T, Dahl CP, et al.  Fatty acid composition in chronic heart failure: low circulating levels of eicosatetraenoic acid and high levels of vaccenic acid are associated with disease severity and mortality. J Intern Med. 2011;Sep;270(3):263-72.

One Response to Choosing an Omega-3 Oil for Your Pet

  1. tilda17 on May 24, 2013 at 11:16 am

    Thanks for your recommendations, Dr. Hofve. Based on an earlier article you wrote on Omega 3’s, I decided to try the Moxxor green lipped mussel caps, and they’re really great. I give my cat one capsule every other day, and it couldn’t be any easier. I wrap a tiny amount of a pill pocket around it, and Izzy eats it with no problem. Honestly, I probably don’t even need to use the pill pocket at all anymore. He already takes atenolol for his cardiomyopathy in a piece of pill pocket, and then gets a treat right afterwards, so he’s used to the routine. Atenolol, then treat. Moxxor, then treat. I think that’s the key to keeping pets interested in the pill pockets.. always give a treat immediately afterwards, the pill pocket is not the treat. Anybody with fussy dogs or cats that don’t like fish oil in their food really should try the Moxxor.. no need to even squeeze out the contents of the capsule, just feed them directly.

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