boxer plott hound mix

I got Athena from Animal Control and I was curious to know what she could be mixed with. I know she is part Boxer but I don't think she is full because her nose doesn't scrunch and point up like most. I saw a picture of a Plott Hound and thought maybe she could be mixed with that because of her...

This is kind of long but I need to know if I should be exercising my dog more. Just a little rundown, he is a ten month old boxer plott hound mix, he gets played with anywhere from 3-5 hours a day inside with another hour or so outside (depending on how the weather is) and he doesn't...