My male boxer just turned 8 months old, and he's 23-24" at the withers, and 43 pounds. I was wondering if this is a normal weight for an 8 month old, and how much he might end up weighing by the time he's full grown. His father was 75 lbs. and his mother 65. He's a pretty skinny 43 (you can see his ribs) and he's very active, and eats 4 and 1/2 cups of food a day (1.5 3 times per day). Thanks for your help.