Can you recommend a good interactive dog toy?

I have a small yorkie mix and he's getting bored while I'm at work. He is exceptionally smart and needs extra durable toys or else they're "dead" in 5 minutes. Anything stuffed is a joke to him. I'm looking for suggestions on any interactive or puzzle toys for small dogs. They're... show more I have a small yorkie mix and he's getting bored while I'm at work. He is exceptionally smart and needs extra durable toys or else they're "dead" in 5 minutes. Anything stuffed is a joke to him. I'm looking for suggestions on any interactive or puzzle toys for small dogs. They're rather expensive so I'd like to get opinions before I just start purchasing different ones. Please keep in mind - he's little but MIGHTY.
Thanks!
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