Sorry to hear poor Bubba is having problems.
I am on another dog list and this topic often comes up. In the last couple weeks there has been a large discussion on probiotics. Repeated rounds of antibiotics or wormers can disrupt the dogs natural enzyme balance in their belly. Several people have endorsed a product called DOGzymes which is a powder that contains all natural enzymes that restore the balance in your dog's digestive system.
I have never used it personally, but it sounds very encouraging. People have tried it and it was the first time ever their puppy had normal stools. Also, I have tried a diet of plain white rice with boiled chicken for several days, slowly reintroducing kibble, and it worked for my pup when he had a case of diahrea. Also....consid er whether you could be overfeeding! That is what I was doing. I was feeding according to the package...but also giving a lot of training treats. Once I reduced the amt of food to account for the training treats...he cleared up. Another option is feed smaller amts more often. Instead of feeding 2 times a day...do 3 smaller meals.
For now, I wouldn't try another kibble...just because if the diahhrea continues, it could be because of the new kibble or an existing problem....you won't know.
You can get the DOGzymes at this site "Nature's Farmacy" (yes, that is the correct
spelling) and the name of the product is DOGzymes and the best form to buy it in
is the powder, or at least I think so and they sell it more that way. -All ingredients are organic and
hypoallergenic . They also have excellent phone support (800) 733-4981.
Let us know how he is doing.