why does my 3 year female boxer keep peeing on her bed when i am out doing errons or

[blue_vue]

going to the gym ? i am packing up boxes she has been spayed at 5 months old and we are moving in a few weeks to a bigger house. she is use to this but she only pees and does this in her kennel. i walk her every day for over an hour and she does her business i thought dogs don't go potty were thay sleep