Another option if your sheep do nice dry pelleted droppings like rabbit pellets - tends to be in winter when they are eating mainly hay - is to sweep these up (I know - looks daft
) and store them in a lidded bucket. When you are preparing your soil for planting dig some of these in, or when you need an extra nutrient boost during the growing season, spread them as a light mulch around hungry plants. No smell, no mess
I take some to my aunt who lives in a city with close neighbours - her garden is now very fertile but no-one gets upset at the smell