@lvoss:
Mine our always wound up when we return from a trip away. I have never felt that it was anger or spite just excitement. It is also really hard for them if you are going right back to work the next morning. We really try to schedule our trips so we have a day with them before going back to work, it gives them enough time to burn off that extra energy boost they get from you returning to home.
+1. I went away on Saturday. True to form, yesterday the dogs were off the wall…even with 2, 3+ mile walks. It is just pent up energy and excitement IMHO.