For the past 2 weeks, my 2 pups have been very " clingy" to me, Is this a stage they go thru ? & how long does it last for ? They make me feel so guilty, leaving them, when I have to go to work, they start to cry, & makes me so darn guilty leaving them, that I have to give them each a pep talk, before I leave, " I see you at supper time", they each get picked up and hugged and kissed and a pep talk. I leave a lite on for them in the kitchen, along with radio. Any suggestions on not getting them so clingy ?