Yes, it contains yeast, but I did some searching and it seems to be a common supplement & as long as he isn't allergic (which he doesn't seem to be) and I'm careful with the dosing (1/2 - 1 tsp per day) it seems like a good thing to add to his diet. Of course like everything these days, there are always 2 opposing views, but I'll see how he goes for a little while.
Here's some info I found about it:
Definition
# Brewer's yeast is a type of nutritional yeast that is often given to dogs as a supplement. Yeasts are one-celled fungal organisms that eat sugars and produce carbon dioxide and alcohol as by-products. They are used to bake bread and brew beer and wine. The specific strain used in most brewer's yeast supplements for dogs is called Saccharomyces cervisiae. Sometimes, brewer's yeast supplements are made from by-products left over from brewing beer, but the highest-quality supplements are made specifically for dogs from fresh ingredients.
Benefits
# Dog owners give their pets brewer's yeast for a variety of different reasons.
First, brewer's yeast is a great source of B vitamins such as biotin, trace minerals such as zinc, proteins, and amino acids. The amino acids and vitamins can help make your dog's skin healthier and its coat shinier.
Second, brewer's yeast is often recommended by holistic vets to help strengthen dogs' immune systems. According to the Encyclopedia of Natural Pet Care, in one study, brewer's yeast was shown to protect chickens from salmonella-tainted feed.
Brewer's yeast is also a common natural remedy for dogs with fleas. Holistic veterinarian Richard Pitcairn recommends it for that purpose. It is thought to work against fleas because it contains sulfur compounds that make your dog less palatable to fleas. However, at least one study showed that brewer's yeast provided dogs no protection whatsoever against fleas compared to a control group.
Risks
# Some dogs are allergic to yeast, and dogs that are allergic to other foods are likely to be allergic to yeast as well. Low quality yeast is especially likely to cause allergic reactions. If your dog has food allergies, introduce high-quality brewer's yeast into its diet cautiously. If you see any signs of an allergic reaction, discontinue the brewer's yeast immediately.
Types
# Brewer's yeast is sold as pills, tablets and as a powdered supplement that can be sprinkled over food. The nutritional content of the yeast is not standardized, and will vary depending on what the yeast was grown on. Compare labels to ensure that your pet is getting the most benefit from the product. There is also a difference between premium brewer's yeast supplements and supplements made from the by-products of the brewing process. Yeast that has been grown specifically for use in supplements has more nutrients and is less likely to cause allergic reactions.
Dosing
# The correct dosage of brewer's yeast depends on the size of the dog and the type of yeast you are using. For powders, 1/2 teaspoon per 10 pounds of body weight is usually recommended. The correct dosage for tablets depends on the size of the tablet. Read and follow the dosing instructions on the package.
Have you tried adding some hot water to the kibble to soften it a bit? add in some vegetable oil or better still buy some cod liver oil from the chemist and add about a desert spoon to the moistened kibble plust 2 tablespoons of mince. I bet there will be nothing left and the oil that soaks into the moist kibble will help it be digested easily too as well as smelling absolutely yummy to him.
As an alternative to the mince, try a hard boiled egg crushed though the same mix of kibble.
i cook up my own rice and veggie mix for my two and it last about a week per pot. 1kg bag of Black and Gold mixed vegies (no corn), bring to the boils with extra water in the pot plus 4 oxo stock cubes, either chicken or beef and a cup of rice. Allow it to cook until the rice is soft. Add a bit more water if necessary. Add 2 packets of Pandaroo rice vermacelli noodles and cook on low simmer until all the water is absorbed.
Acouple of cups of this with whatever meat you decide on, a regular fishoil capsule and a couple of handfuls of dry mix is my two evening meal. There is nothing left after 10 minutes. From my signature you will see that they are medium/large dogs and are really happy on this diet with a chicken drumstick version every week or so and also a three tin special of homebrand sardines each every 2 weeks, the oil variety.
Good luck.