I agree with max here right grub plenty of fats in the raw diet for sessions on the lamp ,we all heard and seen the old mars bar scenario over the yrs ,dinosaur times .there can be know better than good natural stamina conditioning and best raw food Powerade etc hydration dinks can be a saver at times ,but mostly I think watching thy animal in a few minutes breather between every couple runs plenty of water and a cooling bar,stream etc should get one by if natural stamina needed breed for it and breed for a steady running style manic crazy runners burn fuel with out doing very little .atb b