It is so hard to give advice over the internet when I can't see what is going on. I wish I could see what 'over excited' means. What you think of over excited may be normal playfulness, or it could hyper-drive with no self control. Either way, I would have to see what is going on and how you deal with the behaviour to be able to advise you.
its difficult to describe it too. just to clarify, he's always on a leash. we use a drag leash. when i walk backwards it's cue for him to come to me, he'll run over and lean his side against my legs and sniff my hands and ill check his fur, its a regular practice since he rolls in the grass sometimes.
sometimes, he'll sniff my hand and if i move my hand, the way i always do, he'll nip at the air and run away then run back right past me, if i dont walk towards him he'll run back and nip my hand lightly, he'll bow, if i cant get a hold of his leash then either then he'll mouth at me till i move towards him and he'll run and then repeat or if i dont move towards him he'll stand on his hind legs and push my back with his front paws till i move towards him and then he'll run again, he takes long circular paths around me and the yard. sometimes if he cant get close enough to push, he'll bark in a 'look at me, listen to me' sort of way. then he'll just stop if i sit in the corner of the yard and look at me. ill get up and tell him to go upstairs. he understands "up, up, up". he'll run upstairs and ill either lead the way or come after a second after him. up there, i can block the way downstairs and hold his leash.
then ill make him lie down, or lie on his back for a bit. then, ill make him do a command or two with praise as a reward, then ill give a quick look in his ears, his nose, teeth and eyes since i have to tell him to go up so often i practice desensitizing him to having these things checked.
sometime apparently nothing will set him off into this mindset. he'll be walking with me in the yard and sniff my hand and run. or ill toss his ball, he'll fetch it and drop it and then start running.
i really hope this helped explain what i mean. before when his bite inhibition wasnt so great, he used to bite till my hands bled, now it's just mouthing in this case.
thank you so much~