i have a red bird dog and he glows in the sun from the shine on his coat. he doesnt cheat or do 80% on off days and he has been on the prey diet for life. the other thing with my hair is mine is prob 8 - 10 yrs old at the ends so it has been around a very long time. his is short as. plus i wash mine. he doesnt unless he goes for a swim so his is full of natural oils. and being a boy still, he is naturally a bit greasier than a neutered dog. if i left mine to oil up naturally, it would just clump up with hay and dried mud lol as it is so long. i could prob acheive quite a good shine if i cut it as short as his tho.