Home-based business - increase rent?

[Nathan Gesner]

I normally forbid tenants from operating a business from a residential property. However, we have a house on 100 acres and a tenant that wants to breed high-end dogs. These are professional people, not a puppy mill, and their dogs sell for up to $6,000 per. We will obviously ensure they carry proper insurance, abide by the law, and submit to regular inspections.

Question: if they live in the home and operate a business, would you charge them additional rent for the business side? If so, how much?