One of the unfortunate consequences of leaving V at the kennels is that she develops separation anxiety for a while. Not when we're actually out, which I know because her pen is undisturbed when we come back, but when we're home and she's for some reason put in the pen she'll whine and push it and bite it and try to claw her way out. More unfortunately, the only way to put a stop to it is by scolding her severely, which makes me feel like an orc, but I need her to be able to stay in her pen while I'm home, as there are instances when I can't have her roaming around (such as when I'm cleaning the floors or when a visit arrives or when I'm too concentrated with work and can't keep an eye on her).
The only good thing is that I only have to do it once or twice and then she stops and stays quietly in her pen. And as the days pass she gets used to it once more and stops complaining and goes back to normal. Plus, nowadays she only stays in her pen for small intervals. Most of the time I keep her with me. But there are times when I simply can't be with her even if I want to, so sadly I have to go through this re-training period whenever we come back from a trip.