cats

Sounds like a Bengal to me!

When modding the syringe, I find it easiest to remove the plunger, and using a drill bit from the inside that is slightly smaller than this inside diameter of the syringe. 1/32" leaves enough of a lip to still stop the plunger in my experience, but YMMV depending on the plunger style.

We had a 5ml syringe with a fully plastic plunger (no rubber) that was amazing. Eventually lost it and haven't been able to find a replacement yet, but rubber tipped plunger are fine too, just wear out faster.