Raw fed dog suddenly eating poo?

I was out in the garden tonight and saw Harry eating poo
I've not seen him do this before so I am guessing it's a new habit, the only thing I've done recently is changed his food supplier, and he ate a pheasant for the first time a week or so ago.
Could it be he isn't getting enough nutrients? Or something to do with the new food?

who's poop was it?

I assume it was his own poo as he is the one who does it in that area, but I didn't see him do it.

in that case then,imo it because he may not of digested it all completely,and the food was tasty enough to him to try and 'digest' it again