Can anyone suggest anything to try.  I have a six year old Golden male who over the last few months has put weight on.  Have decreased his food and had blood tests by Vet. Nothing has shown up. He is very lethargic, yesterday could not manage his walks without us stopping (at one spot  he laid down and would not move).  Have increased his food slightly today, in case I have cut it too much, he is always hungry.  I feed  twice a day.  He is on Orijen, has a lovely coat, no other symptoms except no energy and does not want to go on his walks, most unusual for my Goldens as we go different walks every afternoon, Mornings are the same walk, more or less.  Any ideas?  Thanks for any help.