non stop barking

Question
Jannie - another question. My male boxer started to bark non stop when I put him in the kennel. I mean he will go from morning to night just barking. It is not a deep threatening bark it is a more like " hey - get me out of here bark" He will stop barking if we let him out, but that is not what Iwant him to think. It is to the point that are neighbors are getting annoyed by it. I need to find a solution to stop this behavior. I do not want to put a muzzle on him or use a shock collar either. Is there something else I can do. PS - He will not bark if I am outside in the yard.  

Answer
How long do you keep him in a kennel?

I do not like kennels and crates- and what size is the kennel- or is it actually a crate?

He has separation anxiety and does not want to be locked up and away from you.

Please answer my question about the size and time- the routine of use of the "kennel" so I can help.