I would pay for a class if it were taught by a professional; I would probably go for free if it were taught by someone unqualified. (No offence; just being honest.) Remember that in most cases it's going to be your word against their vet's.

It would be good to have a class on the basics. My thinking is -- the people going for your class are going to want the answers to questions like: "what's the difference between various kibble brands?" "what's different about grain-free?" "what's so bad about Pedigree?" "when should I take my puppy off puppy food?" "what's the difference between a puppy formula and an ALS formula?"

Personally, I wouldn't attend that class, but I think it would be really helpful to have one like that. There are way too many pet owners who don't know the answers to questions like those.

 

I think you would have to also include information on the digestive system of a dog and how it works so people understand why switching food slowly is important, etc. Also, you could also include information on the optimal levels of the nutrients essential in a dog's diet. It would also be helpful to know what foods are harmful to dogs and in what amounts for different sized dogs.

Honestly, I probably wouldn't pay for a class taught by a non-professional (again, no offence) but I may consider one being taught by a veterinary nutritionist. I say that because I'm not sure how much a veterinarian knows about nutrition. But being someone who makes healthy treats for dogs, you could enlighten your customers with brochures or brief seminars. I wouldn't charge admission but it would bring people to your business as well as teach pet owners the importance of feeding their dogs good food.