Because of their high intelligence boxers have been used over the years in the police, army and even circus… it must partly be their grumpy expressions but Boxers are natural comedians (mine are always making me laugh). Here is a video of a Boxer keeping an audience laughing in a circus performance. You might think that living with a boxer is a bit like being in the circus!
If you have had a boxer for any length of time, you already know they can make you laugh (and take up all the room on the bed/sofa, whatever its size). I think this video shows nicely how loyal they are as well.