Can you try Cow Kitty for a few weeks and see if they have any chemistry. Squeak might hiss at a Kitten but I dont think she would hurt Cow Kitten.
And that Eternal Kitten has been christened Pawlee in your honor and has been officially adopted by Elle, Almond Roca Baton and thier Expanding Family of Eternal Angels.
They will make the announcement at The All Pet Angel Fly In Movies tonight.