Aussie eyes may be any shade of brown, or blue; they may have two differently colored eyes, or even have bicolored or 'split eyes' (for example, a half-brown, half-blue eye), which appear to be linked to the merle coloration. Merled eyes occur, as well, where one color is mixed in and swirled with another. Any combination of eye color is acceptable in the breed standard, so long as the eyes are healthy. DNA testing to either certify parentage or to verify parentage) for Australian Shepherds can be performed, and as of January 2010, all adults producing a litter will be required to be DNA tested to allow a breeder to register a litter with the Australian Shepherd Club of America (ASCA).
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