right i've done some digging this is what I came up with the australians sheep chips are using the ISO standard
(ISO11784/11785, AS5018/5019)
LF 134.2 kHz R taken from a website i can find nothing to say what the eu directive says!
dogs and cats for the puposes of the UK pet passport scheme need scanners that read The micro-chip should comply with ISO standard 11784 or Annex A to ISO standard 11785
equines currently use chips that are read at a frequency of This date forward, the ISO/ANSI compatible FRID chip (11784/85, 134.2 kHz)
now i'm not that bright but me thinks they all look fairly similar.
so maybe someone should check things out to confirm and if possible try out a sheep tag with a dog scanner i'm thinking they would work second hand scanners can be found all over the place from the companies direct or e bay ...........but before you buy DO check everything out i have three scanners for one reason not all scanners read all chips and in theory they are all ISO standard. when you order your tags check out the companies first and ask LOADS ofsquestions or you may be stuck with tags you can't read. and if you follow dog rules you never put in a tag ( chip) unless you've read it first they sometime s come out of the factory defective..................