Made some cats with stash yarns.
I wish designers would include the yardage they used for their project. Just listing a yarn isn’t helpful enough.

Small cat: 190 y, single str, 4.0 mm hook
Larger cat: 380 y, double str, 5.0 hook

Eyes:
15.0 mm cat eyes
Source for beautiful, quality cat eyes:
Hand painted and sent from Ms. Clara at:
6060eyes.com
6060.etsy.com
6060eyes@gmail.com
Inexpensive, very good selection and service.
She sends a personalized signed business card with each order.