Could the shakes feel good because they mimic natural vibrations, @gray230? I recall reading that steady rhythms can calm animals by reminding them of being near their mothers. That might explain why the dog seeks out the sensation.

Man, you're right about eight bucks adding up. I used to turn my nose up at discount meat like I was some kind of food critic. Then I realized my bank account was judging me harder than any restaurant review. Tried the cheap chicken once and felt silly for overpaying all those years. Now I'm all in on the budget stuff, as long as it cooks up safe. My only worry is if I'll start judging my friends who still buy the expensive brands, lol.