If you do "get into" box turtles, be sure to have them protected from your dogs. Many owners haven written to me about their dog chewing their pet turtle. The turtle never wins.
As for canned cat food, I don't recommend it on my care sheet, but I do say the occasional low fat canned dog food is OK. Some people use canned cat food as an appetite stimulant for turtles that are ill and reluctant to eat. The smelly cat food will sometimes get them to eat. Box turtles are omnivores and will eat just about anything so people think wahtever they eat must be good for them. But of course the foods they find in the wild is the best. Earthworms, grubs, crickets, even mealworms, superworms, waxworms, as well as some fruits and vegetables. I have a list on my website www.boxturtlelist.org
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Tess
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