Pyruvate kinase deficiency (PK-def)
Red blood cells break down too soon, so the cat becomes anaemic. It is then tired, eats poorly and loses weight. It can start anywhere between one month and five years old. Many cats with PK-def still live a fairly normal life. A kitten only gets it when both parents are carriers; carriers themselves are healthy.
How it is found: DNA test of the parents. Two carriers are not mated with each other.

