Hi ShannMB –
Exclusive by no means a “rich” food, so this wouldn’t be the cause. It’s possible that it could be due to grains if he’s sensitive to grains, however this isn’t super common and it wouldn’t be my first guess as to what’s causing the issue. Certainly try another food and see if things clear up. I would look for a food with a different protein source. I also would get him on a high quality, multi-strain probiotic supplement – it’s very common for dogs that have been on a single food for a long period of time (as it sounds like he was at the kennel?) to have altered gut flora and due to the weak gut the dog would be more sensitive to changes in food. I would also have him tested for coccidia and giardia. Coccidia should show up on a normal fecal, giardia requires a special test. Coccidia and giardia are fairly common in dogs that come from kennel or shelter type living situations. Good luck!
