My Tonkinese cats are now 17. The male is fit and healthy, eats well and is very alert, purring and happy. His sister is rapidly losing weight, a bit wobbly, not washing properly and hiding in corners though she will sit on my lap and be stroked. You can feel every bone, her coat is rough and staring and she isn't eating though she is drinking. She is not incontinent.. She seems totally uninterested in anything at all.
At what point should I take her to the vet? I love her.