I have fed D&G Moongold to my labrador. She's not a working dog, but she loves the stuff. I only give it to her as a treat so a little goes a long way. I've never rehydrated it. I think it's good for her teeth. All the crunching etc keeps her teeth clean. She's nearly 13 now. I've just bought some Pedro dried meat and I'm waiting for it to be delivered.
Her treat is about half a handful a day. I would recommend it.