You can also try giving them treats from the misc. section of the store when they do something you like.
Also, if they were behaving fine and are now being bums...something to consider is when you're praising them make sure you are praising them for the right things.
I had this problem a couple of times when I went to praise them and didn't realize they had changed their activity without my noticing.
Like I wanted to praise them for showering but was actually praising them for drying their hair...ugh...

Just something to consider...Good luck!
