Manruta Microchip for Dogs and Cats 20 Pack Animal Identification Syringe Preload ISO 11784/11785 FDX-B Universal Standard for Pets Horse Cow Pig Management(2.12X12mm Microchip)Brand: Manruta Color: White Features: 1,ADVICE : pls choose suitable size for your pets or animals , it is very important . 1. 4X8mm microchip suitable for cats ,small puppies ,chicken, duck, owl . for big dogs ,1. 4X8 mm and 2,12X12 mm both sizes are ok . 2. 12X12mm size microchip , it is suitable for big dogs ,horse , cattles , sheeps, pigs, camels and other big animals , 1. 25X7mm size for small fishes , mouses, hamsters, snakes,frog ,pigeon and