Hello, I got my dog a Tug-a-Jug to eat a portion of her kibble out of, and she loves it. (Well, she would probably prefer if I just gave her a heaping bowl of food, but it keeps her occupied, LOL.) I would like to get her a couple of other challenging food dispensing toys to mix things up and give her more mental stimulation. They have to be very sturdily built, as she's very destructive, so things like filling an empty milk jug with kibble are out. Any recommendations? Thanks in advance!