I sometimes use Nature's Menu too. I think when I tried the lamb frozen block his poos were much darker. Since then, I've stuck to the chicken and I have some nuggets too - I just mash them down a bit - they are fine for puppies. The man in the shop said not to give too much tripe though as it would be too rich - just occasionally. Biscuit loves this range so I alternate with NI when he's being fussy.