ob oma ▁of ▁the ▁opt ic ▁disc , ▁ret inal ▁det achment , ▁or ▁int ra oc ular ▁hem or rh age . ▁ ▁It ▁can ▁be ▁diagn osed ▁by ▁fund os copy ▁by ▁the ▁age ▁of ▁six ▁or ▁seven ▁weeks . ▁ ▁Se vere ▁cases ▁may ▁be ▁blind . ▁ ▁Bre eding ▁and ▁testing ▁Cont ro vers ies ▁exist ▁around ▁elimin ating ▁this ▁dis order ▁from ▁bre eding ▁Col lies . ▁ ▁Some ▁veter in ari ans ▁advoc ate ▁only ▁bre eding ▁dogs ▁with ▁no ▁evidence ▁of ▁disease , ▁but ▁this ▁would ▁eliminate ▁a ▁large ▁portion ▁of ▁potential ▁bre eding ▁stock . ▁ ▁Because ▁of ▁this , ▁others ▁recommend ▁only ▁bre eding ▁m ild ly ▁affected ▁dogs , ▁but ▁this ▁would ▁never ▁completely ▁er ad icate ▁the ▁condition . ▁ ▁Also , ▁m ild ▁cases ▁of ▁ch or oid al ▁hyp op las ia ▁may ▁become ▁p ig ment ed ▁and ▁therefore ▁und i agn os able ▁by ▁the ▁age ▁of ▁three ▁to ▁seven ▁months . ▁ ▁If ▁pu pp ies ▁are ▁not ▁checked ▁for ▁CE A ▁before ▁this ▁happens , ▁they ▁may ▁be ▁mistaken ▁for ▁normal ▁and ▁b red ▁as ▁such . ▁ ▁Check ing ▁for ▁CE A ▁by ▁seven ▁weeks ▁of ▁age ▁can ▁eliminate ▁this ▁possibility . ▁ ▁Di agn osis ▁is ▁also ▁difficult ▁in ▁dogs ▁with ▁co ats ▁of ▁dil ute ▁color ▁because ▁lack ▁of ▁p ig ment ▁in ▁the ▁ch or oid ▁of ▁these ▁animals ▁can ▁be ▁confused ▁with ▁ch or oid al ▁hyp op las ia .