I've also heard of putting some gravel in the holes when you bury the crap in it.
Teach 'em fetch. 20 minutes of them chasing tennis balls will really knock a lot of the piss and vinegar out of them. I've found that 15 minutes of fetch will knock out my labs for the night when it takes a walk of about an hour to do the same trick. A couple years ago it'd take 1/2 an hour of fetch, but at 4 years old, they're starting to lose some energy.
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