High fiber anti-anal gland treats?

[Piper's mom]

And, based on Luna, they LOVE it! I do cut up carrots, green beans and up apples (no core!). I put the pieces in a dispensing toy that keeps my active 5-month old puppy interested and busy long enough for me to eat, read the paper, or just enjoy watching her problem solve.

Another veggie that is VERY good for dogs is Broccoli...I always give them the stems. They love them!