I have a 4 year old reverse brindle boxer male. He's currently 126#. No fat to speak of very muscular and tall. I have his papers.gis mom and dad were big but not as big as Marvin. He looks purebred except for his size.i have a boxer named duke. he's 1 year and 4months old. weighs 84 pounds and growing. real strong he'd could rip my arm off if i have him on leash if he was going to chase something and im 216lbs. i took him to the vet today and she brought to my attention the he doesnt look like a full boxer, she said he looks half mastiff. which made me think because everytime i take him to the dog park, new people would ask me if hes a mastiff, and when i tell them hes a boxer they're like "is he full boxer"? could he be a bullmastiff? i bought him from PA, and found out a few months ago that it was a puppy mill. thank God he has no health issues, but his dad was 90+ pounds and looked real mean, not like a regular boxer. they said they were both full breed. being my first dog didnt know about the akc paper which i dont have. what do you guys think? since hes still pretty young his head and body is wider than all other boxer's i seen at full age. how big will he get? here's afew pics, tell me what you guys think and thanks for the responses.