Welcome to YT!
I would be leery of cat toys posing a choking hazard. My mom has yorkies and cats and her dogs are trained to leave the cat toys alone. I would just keep a close eye on him around them until he's old enough to learn.
We would love to see pictures of Gizmo!
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"If you have men who will exclude any of God’s creatures from the shelter of compassion and pity, you will have men who will deal likewise with their fellow men." — St. Francis of Assisi, 1181-1226