I feel guilty, too. I am a teacher, and on summer break now, so I am home, but during the school year, yes, I feel guilty.
Tire her out before you leave, that way, she may spend more of the day sleeping. Also, the kong toy, the black one, is supposed to be for heavy duty chewers, and you can fill it with peanut butter, and then freeze it overnight. That way, it takes longer to get the peanut butter out. Also, there is a brand of toy called "Rough and Rugged" and they work well for our heavy duty chewer.
Tire her out before you leave, that way, she may spend more of the day sleeping. Also, the kong toy, the black one, is supposed to be for heavy duty chewers, and you can fill it with peanut butter, and then freeze it overnight. That way, it takes longer to get the peanut butter out. Also, there is a brand of toy called "Rough and Rugged" and they work well for our heavy duty chewer.