Looking at recent sales I'd say it's worth mid four figures.
dogs.biz went for a little under $2k, and I think pills.biz is considerably better.
If you can find the right buyer (I don't think it would be too difficult with a domain like this) then you could get $5k and maybe up to $10k if there's a few interested in it.
This is a domain to hold onto until you get the price you want, no point throwing it away for a grand or two.