When competing at KC agility shows the dogs will jump a height specific to their size. A Medium dog has to be between 35cm and 43cm and will jump a height of 45cm and a dog that is larger than 43cm will jump a height of 65cm. I had begun to worry that Ruby was borderline between being Medium and Large!
Thankfully she measured Medium - she will need to have a second measurement in a years time but hopefully that will give the same result!