I had a dog with hip displasia and arthritis so I purchased it and liked it so much I import it in wholesale quantities into Canada and sell it through a oscommerce cart.
I target my American audience with the affiliate links. I add the links into the content and use my personal experience with how great my dog did on it to promote sales.
The company provides TONS of free articles and user reviews of the products that you are able to re-use on your site.
The best part is they offer a money back guarantee if your customer doesn't see improvements while they take it, or their dog does, which boosts conversion rates. And a bottle lasts a person one month, and a retriever sized dog two months, so you make money everytime they go back through to buy another bottle. I find that people often purchase 3 bottles at once.