Joe-Diver:A good pre-dive food should produce sufficient lifting gas to offset the initial negative buoyancy at the start of the dive, yet be easily released in carefully measured quantity during the dive to achieve the negative offset required at the end of the dive.
So that's what Science Diet has been doing to my dog! At least I've figured out her warning signs. She'll be laying there peacefully, then get up and move across the room for no reason. I've taken that as a sign to move out of the room.:11: I've decided its best to run away bravely.