There are 2 frequencies as well.
Quote:
The two companies which dominate the U.S. market -- AVID and HomeAgain -- both sell microchips which are optimized to operate at a frequency of 125 kHz...
But in Canada, Europe, Asia and Australia, most microchips for animals adopt a standard (11784/11785) set by the International Organization for Standardization, or ISO, specifying that chips operate at 134.2 kHz.
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http://en.wikipedia.org/wiki/Microchip_implant_(animal)
Banfield will put in both chips when you go them for chipping.
Our shelter charges $28 for the 125 kHz.