Jim Choate says:
I question the validity of the chips use, seems to me that tatooing the ear of the pet and placing this in a database would be much more efficient and a LOT less expensive.
I suspect the chip insertion uses vastly less expensive labor, and probably less expensive gadgetry, as well. There might also be a memory-size problem; I have a cat with an ID number tatooed in one ear -- about the only place where it is reasonably visible on casual inspection. The number is about nine years old, and has four digits. One or two more and there would be trouble reading it.
(The cat is a survivor of feline leukemia research at U. C. Davis; the ID dates from that program. There's a program whereby surviving animals from the Davis labs are placed out.) -- Jay Freeman
Why do you insist on using roman numerals and the English alphabet? There is no reason that some other symbology would not work w/ a larger character set, say 1st char is state, 2nd char is city, 3rd char is vet, 4th/5th char are customer....