If you prefer to avoid chemicals and use a natural flea repellant product on your dog, there are several on the market. (my-favorite-dog.com)
Before spraying any natural flea repellant on furniture or carpeting (or allowing your dog to jump on your furniture after application), do a quick spot test on a hidden portion of your furniture or carpet. (organic-pet-digest.com)
I don't use topical flea repellants because they're loaded with chemicals. (maryvancenc.com)