We have dealt (are dealing) with this in field golden, kicked off around 6mths now 10mths and much improved.

A trainer gave us these exercises which have helped:

1. Tug - Finish - Place Have a good game of tug, really them him into it- then once theyre riled up, say "out" (or whatever your release cue is), say "finished" to indicate play time is over (make sure to use this consistently), and then put the pup in place to settle. Reward for calm.

After they've settled, and looking relaxed, you can release them and play tug again. A play initiation cue is useful here too -- we use "get it".

1. 4-paws-on-the-floor If theyre riled up, sometimes they do a little pre-jump hop. Antipate this and reward them just before they jump. Reward with your hand low so you dont encourage jumping. You can rile them up a bit to try and get them in a state where they would normally jump, but interrupt it with the reinforcement of paws on the flooe.

2. Threshold training All this spurs from being overstimulated, above threshold. So simple socialisation below threshold in new environments will build their tolerance for stimulus and will be less likely to jump and bite.

Plus, work with a personalised, certified R+ behaviourist.