George and Fritz -- two canine litter mates -- spent their entire lives together. In the mornings they squabbled over the tastiest bowl bites. Sufficiently fueled, they then seemed to collaborate on clever schemes, like stealing tennis shoe laces or sneaking into forbidden places. They went on walks together, played and napped side by side.

This went on for 14 years until Fritz died. Suddenly, George no longer acted like the same dog. He slept more, withdrew from social