A. For the most part, a male cat will not harm his kittens as long as there is no competition for food and the cat is not normally aggressive towards other cats.
Usually, the male cat will discourage this behavior when the kittens get older, or if the male tires of it.
The down side is that it does not directly kill fleas so flea shampoos and sprays are still recommended.
This only takes a couple of minutes and if you find a flea, spray the cat or give it a flea bath with a good quality flea shampoo.
This has been treated, and the cat is healthy on a proprietary diet of canned food designed to alter urinary pH.