Dear Abby, My Hounds Refuse to Eat Store-Bought Carrots

No, really! When offered, they will chew them to pieces, spit them out, and look at us with a disgusted-dog expression that says "That ain't food. You can't con us." (We occasionally buy locally grown commercial carrots when making big holiday dishes, to stretch out our supply of hand-grown scarlet nantes.)

I should mention that our hounds are far from starvation. They love peas beans and peas and garden carrots, sliced fresh potatoes (toot, toot), berries and fruit of all varieties. They are also not fussy in many areas, raiding kitchen compost left unattended and scouting for buried cat poop. So, not delicate.

Do they know something I should know?
Signed,
Perplexed

Some brand name carrots have orange colour that rubs off on the skin.  Most loose carrots don't.   This seems to be the deciding factor if my chickens will eat them or not.

Some carrots are also more bitter.