Brewer's yeast for dogs

Brewer's yeast can be a useful supplement, but the marketing around shiny coats and tick protection often goes too far. What it can realistically do depends on the rest of your dog's diet.

What is brewer's yeast?

Brewer's yeast (Saccharomyces cerevisiae) is a yeast left over from the brewing process. After beer production it is dried and processed into powder, flakes or tablets. Unlike baker's yeast, brewer's yeast is inactive, so it no longer ferments in the gut.

Its nutrient profile is what makes it relevant. Brewer's yeast contains:

• B vitamins: B1 (thiamine), B2 (riboflavin), B6 (pyridoxine), and biotin
• Trace elements such as zinc and selenium
• Essential amino acids
• Roughly 40 to 50 per cent protein

B vitamins are water-soluble. The body does not store them for long, so any excess is excreted and regular intake through food matters.

What brewer's yeast can provide

Brewer's yeast is not a medicine and not a miracle cure. It is a supplement with a useful nutrient profile. What it can realistically contribute:

Top up B vitamins. High-quality complete foods usually cover the requirement. Supplementation can still make sense with home-prepared diets, very limited feeding plans, or periods of increased demand such as stress, pregnancy or growth.

Support skin and coat. Biotin and zinc are involved in skin metabolism. Many owners report a shinier coat after a few weeks of brewer's yeast. That is plausible if there was a mild shortfall beforehand. If the base diet was already adequate, the visible effect is usually small.

Add amino acids. With a protein content of roughly 45 per cent and a broad amino acid profile, brewer's yeast can contribute to protein intake. If your dog already gets enough meat, that is rarely the deciding factor.

Whether brewer's yeast is worth using depends on the dog's starting diet. A balanced complete food with an appropriate meat content usually leaves little gap for it to fill.

Application and dosage

Brewer's yeast comes as powder, flakes and tablets. Powder is easiest to stir into wet food. Some dogs like the slightly nutty, yeasty taste straight away. Others need a few days to accept it.

As a rough guide, dogs up to 10 kg can have around 0.5 to 1 g per day, dogs from 10 to 25 kg around 1 to 2 g, and dogs over 25 kg around 2 to 4 g.

For tablets, follow the manufacturer's directions. Start low and increase over about a week. That makes it easier to spot whether your dog tolerates the yeast well. Flatulence or soft stools can mean the amount is too high.

Brewer's yeast should be given with food, not on an empty stomach. If you feed BARF, you can include it as a regular part of the ration.

Brewer's yeast as tick protection?

One of the most stubborn claims around brewer's yeast is that it repels ticks. The theory is that B vitamins change the dog's skin odour and make ticks avoid it.

Some owners report fewer ticks after longer use. That is anecdote, not solid evidence. There are no controlled studies showing a reliable effect. Tick burden also depends on weather, region, walking routes and coat type, so individual reports do not prove much.

Relying on brewer's yeast for tick control can leave a dog exposed. Lyme disease and other tick-borne diseases are serious risks. For reliable protection, speak to your vet.

When brewer's yeast is not suitable

Brewer's yeast contains purines. When the body breaks purines down, it produces uric acid. That is a problem for some dogs.

Kidney disease means uric acid is excreted less efficiently. Brewer's yeast can place extra strain on already compromised kidneys.

A tendency towards urate stones matters too. Dalmatians and some other breeds are genetically predisposed, so purine-rich supplements such as brewer's yeast are contraindicated.

Yeast intolerance is another reason to avoid it. Some dogs react with pruritus, skin flare-ups or digestive upset.

If your dog has skin disease, chronic pruritus or digestive problems, your vet should be the first port of call. Brewer's yeast cannot solve those problems and should never stand in for a proper work-up.

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