I just want to say that separation anxiety is something that CAN be hereditary, just like fur chewing in chinchillas. However, like someone else said, many "puppies" go through a bout of this at a certain age. Kali never did it, but Orion went through it at about 10 months old. It was odd, because he was born into this family and things didn't change much so why did he go through it? Goodness only knows, but he cried, whinned, shredded things, ate a hole in 2 mattresses, chewed, clawed and forced his way through the bathroom door in a matter of 10 minutes...it was AWFUL!! We did a LOT of the "pretending to take stuff outside" and short drives around the block and such to get him to understand that just because we are out of sight for a minute, we aren't gone FOREVER! Another thing we did was NOT make a big deal when we got home. Most people think if they praise, praise, praise the second they walk in the door, their dogs will feel better. That's not true. It builds it up even worse because of the expectation factor. It actually can worsen the anxiety because of the anticipation! So, we worked on making coming home "no big deal" therefore taking the anticipation factor away. When we came home, we would walk past the dogs and go about our business as if we had been home all that time. After a few months of working on it, things got MUCH better. Now, Orion only has problems if we leave and take Kali with us. If she's here, he's okay, but left alone without her, he gets destructive. THAT, I can live with, because its VERY rare that Kali goes anywhere without him.