Last October, we put our sheltie, who we had had for 10 years (he was 11), to sleep because he’d gone blind, deaf, and his arthritis was horrible. Since then, our miniature schnauzer seems to have been affected by it. They played all the time from almost the moment we brought our mini home (about 5 years ago), even though our mini was an inside dog and the sheltie, an outside dog. Since our sheltie has disappeared, our schnauzer seems to have gotten quieter, doesn’t enjoy play as much, and is even shyer with our guests. I know it’s not a medical problem, as she had her check up a few weeks ago and everything was good. She turned 5 years old this month, but that’s no reason for the sudden change, is it? So could she be grieving over our sheltie? If so, what am I supposed to do?