In a sampling of petfood, the Consumers' Foundation found some dog food sold in China may contain preservatives that could affect the health of dogs if too much is consumed, according to The China Post.

The foundation found that eight out 20 dry dog food and canned dog food products purchased from retailers in September 2010 were found to contain sorbic acid. The Consumers' Foundation said the report findings are for consumer reference only, because China does not currently have laws in place that limit the amount of preservatives allowed in petfood.

One of two companies whose petfood the foundation found to contain too many preservatives claimed it is difficult to avoid having a certain level of preservatives in its products because there are no standards to follow, while the other claimed its products are safe because it follows European standards.