Hi there! As the other poster mentioned, not enough excersize can make them start to demonstrate bad behavior. Have you tried any training aids, like those sprays that are suppose to keep them off/away from objects? Though, I havent had that particular problem with Meka, but maybe its worth trying.
Also, wanted to know why you wouldnt be able to crate train your dog now? I've had Meka since she was 9 wks and didnt start out crate training. However, from about 8 mo's to 1 yr she had really regressed in her potty training. It was at that time that we began to crate train her and it was the best thing we ever did. It really helped fix the problems we were having
Hope you get the answers your looking for.