I had a dog which died 4 years back at the age of 15. :-( the day she died, she couldn't even breathe at morning. We all were asleep. She went to my parents bedroom somehow and woke them up. My dad called me and my sister. She left us only after seeing all of us.
She couldn't even walk for last 10 days of her life. I still wonder how she managed to walk from hall to my parent's bedroom (around 20feet distance) when she couldn't even walk couple of*steps. Trust me, dogs fulfils the family.
Well, not every dog is wild. Even stray dogs are very honest and adorable. My grandmother used to feed a stray dog. When my grandfather passed away she went in state of shock and she's mentally ill now. The same stray dog come and sit near my grandmother for all the day, like he is protecting her.