I bet using everclear would work even better, no boil required.

The alcohol will evaporate, but the essential oils won't be damaged by heat and you will get a much higher extraction rate since oils are hydro phobic.

Do you strain it then?

idk

I'd be reluctant to take the risk. Better to check with a vet before trying it.

Of course you could always just dry rub a toy with some fresh catnip. The old fashion way.....