What happens when cats inbred?

Inbreeding could lead to smaller litter sizes, immune deficiencies, increased incidences of congenital abnormalities or cats that fail to grow to a normal, full size.

Can inbred cats be healthy?

As recessive genes appear, they can be eliminated by selective breeding. However, there are additional problems with inbreeding cats. ... The Cat Fanciers Association of America notes that inbreeding may lead to immune deficiencies, more congenital abnormalities and cats that don't grow to their potential.