Not really sure what you mean, but the difference between a roan and a ticked dog can be a little confusing sometimes. The dog in the Southland photo looks to me like a blue roan, although the very heavy dark spots are probably what is causing people to say it might be ticked. Hard to say without seein a full body pic.
In general, roaning is more "blended", the dark hair and light hair are more mixed in, where ticking is more like spots, with a definate color change. Speaking for myself most of the ticked dogs I have seen are black and whites.
As far as breeders go, color breeding in particolors is inexact, to say the least! Any particolor breeder has the potential to breed a ticked dog so theoretically they aren't all that hard to find.
There are lots of roans on this site, maybe someone will post a pic of a ticked dog!