This first showed up on the 14th, when a dog collided with him in the  dog park, but he had been playing very roughly with another dog two days  beforehand so I can't rule out anything.  Anyway, he yelped at the  collision, yipped once again when he flopped down on his side, and  yelped coming up the riverbank during his last "you just yelped; we are  going home" rinse.  And complaned a bit while settling into the back  seat.  He seemed fine the next day, so on the day after that we went out  on a play date with a friend's ES dogs.  He then yelped a few times  that day, but nobody could pin anything down by looking at him. (There  was no obvious limp and there never has been)
Rested him for a  week, he seemed ok, so we went to one of his Akita friend's birthday  parties.  He won best swimmer, and only yelped once while playing-but I  thought his Akita friend stepped on him.  So we went hiking with my  friend and her ES the next day, whereupon he hurled himself over a  fallen sapling-and yelped.  This time my friend could definitely see his  limp, so we went into the vet on Tuesday.
The vet felt his hind  legs, and watched him walk.  She declared he had a stiff right knee,  and proclaimed it either a sprain, strain, or a stretched or partially  torn ligament.  She then gave us anti-inflammatories until Friday, and  orders to rest in the apartment for a week.  After that, we were  supposed to "take it easy".   I was and still am not pleased with the  vagueness.
We've mostly rested for a week-keeping a 9-10 month  old ES from galloping around the house is not easy.  We went to his  class last night and his trainer said his right heel was wobbling a bit,  and it was messing up his gait.  It also looks like he's not putting  all his weight on the leg-it has a tendency to toe-out.
I took  Chandler out for a swim today.He seemed rather quiet for his first time  off leash.
On land, it looked like his right leg was moving out to  the side a bit when he walked, or something.
The fact that it's not  easy to see is driving me crazy.
So we're back to the vet on  Friday, because he's not quite right.  This time we're seeing the head  vet of the practice, so its sort of like having a second opinion.
It's   just frusterating because his limp is so subtle, and they're being  very vague.  Plus I have other opinions ranging from "did you check for  lyme?" to "it could be growing pains"...none of which have been ruled  out as far as I know.
*FUUUUUUUUUUUUUUUSSSSSSSSSSSSSSSSSSSS*
Anyway, here's a view of Chandler's valiant defense of the mud puddle, before all this happened.
Yes, he soaked up most of it into his fur.
