
Burns do respond to their help line. I've been onto them, in the past, to good effect, even if I don't use Burns now - sorry Burnspet.
I don't subscribe to a Senior diet however - haven't really had to. If I needed to watch weight for eg, I just cut back, and if there was a dental issue causing an eating prob. then it was off to the vet. I too wouldn't have expected a different coloured stool indicated a need for a 'senior' food.