I can rely on Freeda to let me know if a food is not A+ taste-wise. I tossed her a new treat I had baked myself and she promptly spit it out, sniffed it, nibbled at it and then decided it was good enough to eat.
Freeda is obsessive about her kong, She wants it thrown so she can chase it down and bring it back to you for another throw. So far no one has been able to outlast her - the humans always quit before she does. I don't think she has ever quit. She will hold in her mouth until she catches her breath, but she never just drops it. Sometimes, I have to put it up, after which she will go and find any other toy and bring it.