And yes, it IS a great idea for taming chicks. I have a little d'uccle that goes everywhere with me. We even have a barred rock roo that loves people as well as some RIRs and an egger. Never knew how much fun chickens could be!
All dog food is garbage, won't find a bag of the stuff here and I raise and show dogs! I am taking the same approach with my chickens. The more natural the diet (per species of course) the better for the animal. pretty simple.
I wouldn't feed that garbage to a cockroach. Those soft kibbles are worse than the regular because they use propylene glycol to retain moisture and preserve. PG is a cousin to antifreeze and is a potential carcinogen if not an outright cancer-causing agent. Nasty stuff.