I know you've already seen this picture, but I wanted to show it again. As you know, my biggest fear is that Cadie will break her very long legs, and we will have to fix them. This fear isn't totally irrational as my last dog had a broken leg, and the care she required at that time haunts me still.
I had noticed a change to Cadie's gait a while back, and I kept asking people if her legs looked broken. They always answered no, but I was convinced that there was something wrong. So I brought it up with my vet. She had Cadie walk up and down the stairs several times over, then she watched Cadie walk straight across the room.
It turns out that Cadie has a ligament injury on her back right leg. So she's been favouring the right by shifting her weight to the back left (something you can see her doing in the picture above).
Not great news, but obviously it's not a break, so it's not terrible news. However, it means that we are now doing some light stretches after our walks to help ease the injury, in the hopes that Cadie will stop shifting her weight. This will also make a difference to the way we play with the tennis ball, no more high balls, from now on we have to roll them across the grass. I'm glad we caught this early.