Such a cute kitten, who has an inherited neurological condition which causes her to shake her head as she does. A sort of tremor. She - I think she is female - is playing with the dog. She turns herself side ways on and arches her back to look large. This is play fighting. Typical of kittens. The dog is a cattle dog and massive in size, compared. Such little kittens always look so vulnerable in the presence of large dog companions but this dog has nothing but love for his friend. The kitten's medical condition is not life threatening and does effect her enjoyment of life it seems.
The kitten has a bobbed tail too (shortened tail). I wonder if these conditions are linked?