One thing I feel the need to point out: If you have a boxer that really does seem to be very sluggish (I don't mean lethargic like when they are very sick), You may want to look into getting their thyroid level checked. Low thyroid is very common in boxers, as I found out. When J.C. was taking his obedience classes, some days it felt like I was dragging him around by his leash. It was suggested to me to have him checked so I did. He tested very low and was put on medication. He is a very different dog now and is currently taking agility classes, something I wouldn't have dreamed of doing before with him. So please get them checked if you think this might be the case. It might seem nice to have a really laid back boxer, but it is not much of a life for them.