My Keely, passed away last September at just 6 years old, from cardio myopathy, which is common to Boxers.
Our other dog, 46 lbs of Pit/Boxer mix which we could never have out with Keely after they started fighting (we could have worked with them but there was resistance from the wife-her nerves couldn't take the stress). The brat, hyper, playful and daddy's little puppy, Roxy: