We have two Ocicat kittens who will be 2 years old in April. Yesterday, the little girl produced a big hair ball. We used to have Persians and groomed them pretty regularly, partly to avoid this sort of thing, but Ocis are short-haired and need brushing only about once every two weeks. Should I brush them more thoroughly and more often? Or is there a dietary (or other) way to minimise regurgitaton of fur? I'd be grateful for any sage advice, many thanks.