I'm having a couple of issues with my 13 week old labrador puppy. The main issue is the jumping and hyperactivity around visitors. I put a lead on her when they come in and keep it short and tight until she's calmed down, seen everyone and had a stroke but as soon as she's let off the lead she goes nuts and jumps up on them, wants 100% attention etc. I command her down in a stern voice and she responds for around 3 seconds and then she's back to doing it again. We only have visitors once or twice a week and she's fine with us.
What can I do differently?