I know exactly what you mean. I've had Ruckus since I was 14 years old, 12 LONG years ago. When I was 21, my mom was very unexpectantly killed. I was beyond devestated. Throughout everything, Ruckus was there for me. Almost everyday, I would come home and cry on his shoulder. He would always just do the boxer lean back into me and sit there as long as I needed him to. On a positive note, when I was 15 - 18 and going through my wild streak (that we all do!) I would tell Ruckus all my little secrets! I didn't have to worry about him tattling on me!
Ruckus, Roxy, Bosco, Bain (B & B - my fosters) and I are sending a lot of good wishes to your family as your mom goes through her treatments.