A domesticated DOG!
Now before you diss that one out as there are literally many animals that are far more better than the most common household pet, the dog. You should consider first what is currently the most well-loved and well-petted animal by humans for centuries now. That's right, it's none other than the dog.
If I become a domesticated dog, I would receive the love and attention of my human owner. I would not worry anymore on food, hygiene and whatever problems an animal has to do in order to survive. Basically, my future is at most very-secured.