First off, how long have you had Zoe?
For the most part it sounds like he's being territorily about HIS kennel, but at the same time it's concerning because dogs don't like to mess their dens. I would take him to the vet just to be safe.
As for the emotional problems I wouldn't worry too much, he'll adjust. When we got our rat terrier a year ago our beagle was NOT happy, she pouted, sulked and even attacked baby Yuri a couple times. Dogs can be very jealous creatures. It'll work out in the end, though, mine are the best of friends now.
Keep us updated.
Deirdre
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