Sometimes, when someone has led a nearly perfect life but is not yet worthy of nirvana, that person is reincarnated as a very beautiful dog. When the life as the dog comes to an end, the person is reincarnated one last time as a human being, and lives a perfect life. Your dog is a person who has almost arrived at complete enlightenment and will in the next life be perfect and blameless, a very great person. You have been given stewardship of what you in your faith might call a holy soul.