Just work on the "leave it" command with the kitties. I kept my girl on a leash around the cats until she learned to "leave it" and then I taught her "go easy" so she could check them out. You may not want to use the leash, given that he only seems to be chasing them and not trying to hurt them, but "leave it" will probably help. I bet he'll be fine.
Enjoy! He looks like a great boy.

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