pfft I don't think so... man I've literally slain the mew kat close to 50x.... did some really heavy grinding on the scarlet fortress I'm am pretty sure it doesn't drop unless its like a .0001% chance....
I've gotten Light Shards, Dark Shards, Soul Dust, Owlite Feathers, Ecto Drop, and a Ghost bell and I think thats about it
if its supposed to drop from it then I'd recommend a GM looking into it
A Kat and a Mewkat are two different monsters, if you weren't aware.