Hello, I have 2 kittens who are brothers. They are 7 months old and I have noticed that one has odd clicky knee, You can clearly see it when he walks but shows no sign of pain and he races around like a normal young kitty. Has anyone had experience of this? They both have had kitten vet visits so are both healthy in every other way but for the same kitten who has a bit of a heart murmur not quite a grade 1. Of course I am going to take him to the vet over the next week about this.