Hey There!
We put a tiny bit of butter on our finger daily or every couple of days. Zsa Zsa will lick the butter right off and hasn't had a hair ball since.
It's worked with all of our cats.
Someone years ago told me to use Crisco..but <blech>
Thank goodness our basset hound doesn't have hairballs...now that would be really gross.
HA!
Donna