Taurine for dogs: what it does, and why it made headlines

Taurine is an amino acid that supports normal heart muscle function, and most dogs make enough of their own without needing it from food. It became a bigger topic after some dogs on grain-free diets developed taurine-deficient dilated cardiomyopathy (a heart disease), prompting an FDA investigation. Cocker Spaniels, Golden Retrievers, and Newfoundlands are more dependent on dietary taurine and worth monitoring if they're on a boutique or grain-free diet.

Most dogs never need to think about taurine. Unlike cats, who must get it from food because they can't make their own, dogs can synthesise taurine internally from other amino acids, and for most of them, that's enough. The reason the word shows up in more conversations now than it did ten years ago has less to do with dogs generally and more to do with a specific dietary trend that turned out to interact with it in an unexpected way.

What taurine actually does

Taurine is involved in cardiac muscle function, bile acid conjugation, and maintaining normal cell function throughout the body. Its best-documented role is in heart health: taurine helps regulate calcium levels inside heart muscle cells, which is part of what keeps the heart contracting normally and efficiently.

The grain-free connection

In the late 2010s, vets started seeing dilated cardiomyopathy, a disease where the heart muscle thins and the chambers enlarge, in breeds that weren't typically prone to it, including Golden Retrievers. A number of these dogs were eating grain-free diets, and several were found to have low taurine levels. The FDA opened an investigation into a possible link between certain grain-free and "boutique" diets and DCM.

The exact mechanism was never fully pinned down. It's not as simple as "grain-free causes taurine deficiency." The suspected diets tended to rely heavily on legumes like peas and lentils as a substitute for grain, and something about that substitution, whether it's reduced taurine precursor availability, an absorption issue, or something else entirely, seems to have affected a subset of dogs on those diets. An early case series had already documented taurine-deficient DCM in dogs on lamb-and-rice or other unconventional diets years before the grain-free trend made it a bigger story (Fascetti et al., 2003).

A chiaroscuro-lit still life of whole grains and legumes on a white background — The grain-free story was never really about grain. It was about what the substitute ingredients did to taurine availability in a small number of dogs.

Which dogs are actually at higher risk

Some breeds appear less able to synthesise adequate taurine on their own and are more dependent on getting enough from diet. Cocker Spaniels, Golden Retrievers, and Newfoundlands show up repeatedly in the research as breeds where taurine status is worth paying closer attention to, particularly if they're on a boutique, grain-free, or home-prepared diet. For most other breeds eating a complete, properly formulated commercial diet, taurine deficiency is genuinely uncommon.

What to do if you're concerned

If your dog is one of the higher-risk breeds, or is on a grain-free or home-cooked diet, the right move is a conversation with your vet, not a home diagnosis. Taurine status can be checked with a blood test, and if a dog is already diagnosed with DCM, taurine supplementation has shown real benefit: a 2023 study found it improved markers of the renin-angiotensin-aldosterone system in dogs with congestive heart failure (Brethel et al., 2023). That's a treatment decision for a vet to guide, not something to self-manage with an over-the-counter product.

Why Essential includes taurine

For dogs without a diagnosed deficiency, taurine isn't a treatment, it's routine support, in the same category as the vitamin E and selenium also included for general antioxidant and metabolic function. Broono Essential includes taurine as part of that baseline, not as a response to a specific problem. If your dog has been flagged for a heart condition or diagnosed with low taurine, talk to your vet about supplementation directly rather than relying on a general daily chew to address it.