Separation anxiety?

While we were away in vacation Maki stayed with one of Elizabeth's co-workers. They have a house and a really, really big yard. They also have a dog named Omega, she is very cute and gets along with Maki wonderfully. In his stay in their house, Maki spent 8 hours of his day in his crate, with Omega as company and moral support. After we picked Maki up, he returned to his routine. This involves a walk or run in the morning, a walk mid-day and a walk/run at night. On Monday as usual we started his routine, which also involves recording his day so we know how his separation anxiety is doing. Previously this is what one of Maki's average days would look like:
To brake it down: The image represents about 8 hours. There are some small peaks (like at the left of the image above) that are just the noise from either the hard drive, refrigerator, the occasional plane, or the dog walkers. The really big peaks (middle and right of image above) that are out of range for the recorder are Maki's barks, whines and other noises. Those are directly related to his separation anxiety... basically it has been very bad. This has been one of the harder things for us to deal with and for him to improve. Well to our surprise this is what the recording on the Monday after our vacation looked like!!
It was obvious that he had done incredibly better! Maybe a couple barks and a whine, but much better! but was this a fluke? or was he depressed because his girlfriend Omega was not around? We couldn't be sure, so we continued his subsequent days as usual. To our surprise Tuesday through Thursday were incredible ... absolutely no barks!! we are very very happy with his improvement throughout this week! (Note: there was no Friday recording because I had the day off). Will this last? Hopefully... but for now we are very proud of the little pig.

- Daniel