I DO NOT agree with breeding silver labs, they shouldnt be bred and they certainly shouldnt be bred for money like these breeders are doing.

labs can come in alot of mismarks
i think there was a link posted about mismarked labs on here? or maybe that was a different board...

here is something on black and tan labs
http://cdc.guidingeyes.org/Adoptions/pdf2.pdf

and here is a site about other mismarks
http://www.blueknightlabs.com/mismarks/