I think this is strange to see in a dog that is almost 5 years. Surely by that time, they have become quite calm. Fraser is having a phase of enthusiastically greeting people as he's always done, but as they stoop to engage, he takes fright and backs away crouching. His body language is desire to greet and anxiety. Male of female, no distinction. He's always been a happy greeter, loves it when passing people make eye contact and then he's over to greet. I know they go through fear phases when developing, but he's 5. I wrote few months ago that his morning greeting also had little yelps and pull aways and then that behaviour died out and he was back to a little morning hug and face down, bum up wriggling while being petted. Also a short phase when he'd yelp and back off when the food dish was put down. That one went away when I made him leave until given permission to eat. Now he sits and bores his eyes into my head in a firm stay until he gets the word 'okay' and proceeds to eat. The through thread here seems to be moments of high excitement. Has anyone here dealt with this kind of behaviour?