"Anything bigger than 30G is pretty big in my opinion". That's wrong, the higher the number, the thinner the needle, same as in wiring and metal. Look for a 29 or even a 31 gauge if you can get it. I've been using Monoject 3/10 cc, 29 gauge on two cats for years and have never heard a peep. If you're using the official Caninsulin syringe don't be afraid to switch. The math is easy and both my vets agreed with me. There's a conversion table on the site somewhere. If you can't find it; Monoject syringes that are 3/10cc with 30 lines means each line is .01cc (.3 divided by 30). My Caninsulin syringes are 1cc and 40lines so each line or "unit" is .025cc. TAKE NOTE, this is the Canadian system. I inject Noah on his haunches, more meat, further from the spine.