i have been told by a mate,, that the dna test can tell the exact persentages of the difrent breeds within that dog,, so in theroy if you have a bitsa type lurcher it can tell all the difrent breeds.
my mate,,, has a mate with a plummer lurcher,,, he had this test done,,, and it came back that there was australian collie in there,,,,
but lets be honest,, provided your lurcher does what you want, does it matter,,,, and i bet most pedigree dogs have other bits in there if they checked