Dennis,
IMO, just mine, I definitely think you should change brands from Blue Buffalo, both due to the concentrated legumes (be aware of “splitting,” which is found here — which is listing peas, but then separately all the separate parts of peas, which would otherwise be listed even higher in the ingredients) and the quality standards/control of the company.
There are a number of more reputable companies (my opinion) out there from which to choose, especially since your dogs can have chicken (most commonly available). I would choose one that is grain inclusive/not a concentrated source of either legumes or potatoes.
There are some awesome small breeds owners on this website that could give you more advice not only on food but longevity in these breeds and yours specifically. My dogs have been long lived, but large breed. Good luck.
