My cat Posie is very laid back but even she gets fed up on these wet, cold, winter days. She will leave my yarn alone but I have made her round toys in the past. I've been so busy lately that I haven't got the time to crochet another thing. Hence I have a limitless supply of yarn ends.
Take a section and tie the ends together.
Scrunch them up. With the end of the yarn ball knot it around to make sure all the ends are safe.
Here's Posie checking one I made earlier before picking it up in her mouth and running away with it.
No better endorsment than that!