I used Nutro's natural lamb for years and Sheba did
very well on it.
For some reason, Rocky did not. So than I had tried a couple of human grade foods and Rocky still did not do well.
That is how I ended up using Canidae or I would never
have switched a few years back.
(Sheba's coat was more shiney with the Nutro,
and I do add an oil supplement to her food)
Could be because she is a senior too?

I think Nutro is a good food and I would have never
switched if it wasn't for Rocky.
Try the Nutro and see if Dale's tummy does well.