Smiter
I have a 13 month old x lab/staff. He is extremely friendly to people but causes us major problems when anyone comes to the house. He is perfectly obedient when it's just me and hubby but as soon as anyone comes to the door he goes into major hyper mode which lasts for about 20 mins. He bounces up, runs round, nearly knocks people over just generally naughtyness. I know it's because he is excited but just can't seem to calm him down. We try excluding him into the garden but that just serves to get him more wound up, he launches himself at the door trying to get in. He is very very food orientated and we have managed to get him to sit and wait when hubby comes home from work as he has learned that hubby will have a biscuit for him if he does sit and wait. I have tried the same trick with visitors but to no avail. Once the initial 20 mins has passed he goes back to being the well behaved dog that he is with just us in the house. HELP!!!
Have you tried finding a specialist trainer who would come to your house? Or squirting him with water when he jumps up? Can he be put on the lead when people arrive? Or ask your visitors to walk straight in, not look at the dog, completely ignore it and try turning their backs. If it jumps up in front of the visitor, or anyone, try lifting your knee up very quickly, knocking it back or making a barrier between you. These are some things that have worked for me.