The Last Free Cat by Jon Blake
Not far in the future, cat flu has meant that cat breeding is strictly controlled, and cats are only for the rich in their private estates.
When Feela turns up in Jade's garden, she can't resist taking her in, even though it could cost her everything.
But then Feela gets sick, and Jade is forced to seek help. But soon Comprot are raiding Jade's house. When Jade's mother dies, the only person left for Jade to turn to is Kris, the cynical school loner.
Jade has always trusted the authorities, but now she begins to question the very society she lives in. And soon Jade and Kris are on the run ...