Awww...I'm so sorry about the pup.

I know exactly what you mean about guilt with riding. DH and I almost always ride together, which means the pup is home alone. We both feel a little guilty that we are out enjoying the fresh air while she is locked inside. She's a really lazy dog, but still enjoys a walk around the neighborhood and loves attention. We've had weekends where we decided not to ride because we felt like we were abandoning our dog. We now try to take her out for a walk after our rides.