My 4 month old cat has fleas so I washed him with hair and mane shampoo which is typically for horses.think that is OK? Also, does anyone know if 20 mule team borax is safe around the pets and kids?

I don't know about using hair and mane shampoo. Should say on the label what animals for which it can be used.

I have had cats all of my life. They are an indoor house pet. They don't need to go outside. No problem with fleas, then. They are very content to stay inside, unless they have not been spayed or neutered. Always spay or neuter your pet so that they will not suffer. Just my opinion and experience.

Also, if cats are allowed to roam freely outside, they are in danger of catching feline AIDS.

Household chemicals and cleaners should always be stored up and out of the reach of and preferably behind closed and locked doors from children. They might drink the stuff if it looks and smells pretty. If it is a powder or in some other granulated form, they might play with it like sand and get it on their skin or in their eyes.