Dogs must interpret grapes universally.

Every dog I've owned trated grapes with confusion. Toss a grape near them, and they would sniff curiously, lap it up, then spit it right back out...as if to say, "hmmm, look like food, feels like a toy"...

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2009 ML350 (106K) - Family vehicle
2001 CLK430 Cabriolet (80K) - Wife's car
2005 BMW 645CI (138K) - My daily driver
2016 Mustang (32K) - Daughter's car