Cat Harness and Leash for Walking Escape Proof Soft Adjustable Cat Leash Breathable Comfortable Vest Easy to Wear Kitten Harness for Outdoor Travel (Black, S (7-12lb))

This is the harness I'm using. Even when he's gotten spooked and jerks around he hasn't gotten away. Big no on this one It might fit a mouse. I got it because I had a Target gift card but ended up returning it.