I have a 10 month old male pit/border collie, male....he is very intelligent, knows many commands... My issue is I can't get him to stop jumping on everyone. I have tried just about everything, and he has bad separation anxiety. When I go somewhere, even if just to the mailbox, he is so excited to see me come in the door. I usually have to squat down or sit so he don't scratch me all to pieces. Any suggestions on how to correct this behavior?