Ruling out any illness - I'd say Grace was growing up! I wish Ben would at times but I've been assured that I will miss all this puppy exuberance once it calms down (yeah right)
Ben was off colour the other day and went for a 6 month old pup
He too was walking with me very calmly although off lead, I know he was tired as we had been out for 2 x 2 hour walks in the day but this was his evening stroll which he had nagged me for. The next day he had the runs so I think he was just feeling rotten. Hopefully this is just the human like stage where children stop running round the playground and calm down a bit?
Let me know if this carries on as I would like to see a light at the end of this energetic tunnel!