Implant or GPS chip for cats and dogs, how to choose?

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Microchip implant (animal) - Wikipedia

20 Packs 1.4x8mm, ISENVO Pet Microchips 134.2khz Registration Animal Implant Chip FDX-B Pet ID Microchip for Dog Cat Cow Pig Rabbit Pigeon Fish

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Microchip implant (animal) - Wikipedia

Everything You Need to Know About Microchips

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