Oh my god....someone else with the same problem as me!!!! I'm not alone!!

I have two cocker's that are brothers. Dexter has ALWAYS loved his food and no sooner its down on the floor he has gobbled it all up. Dillon has always enjoyed his food but a little more of a 'polite' eater (by this i mean he literally eats only one biscuit at a time, making sure its FULLY chewed before swallowing it!!) He takes about 20 minutes to eat his dinner but it was always gone in the morning and evenings. They were on James Wellbeloved and then about 3 months ago we changed to wainwrights - just for a bit of variation to flavor and size of the biscuits. Dillon still ate all his meals but then just suddenly stopped....
We tried everything....adding water, meat, coating the biscuits in meat paste(which was amusing to watch as he just sucked off the meat paste then spat out the whole biscuits onto the floor - clever dog!), adding very diluted gravy stuff, tinned food....nothing worked!! However if i sit on the floor with him and feed him one by one, he will eat the whole bowl??

So then i went back to the James Wellbeloved....but still no....he seems to be hungry and wags his tail and waits perfectly but then just sniffs it and walks away. I've altered the feeding times to now feeding him after his long evening walk so he can build up his appetite but still no joy.

I think tonight he maybe ate about 1/3 of his dinner but another thing I've noticed is that his fur is all changing, He has always had very fine wispy fur (he's never had to be clipped!), and it suddenly gone super soft and fluffy (not very good with descriptive words!), and it seems to be getting thicker and I've suddenly noticed he has so much more feathers on his legs.....i think they grew overnight?!
I'm not sure whether the condition of his coat is related in anyway to him not eating or whether I'm slightly going off on a tangent!!
Any other ideas would be greatly appreciated because I'm running out!
