It comes down to being familiar with the look of the different lines and the kennel names, and it takes a while. After seeing a lot of pics of dogs, and looking at a lot of pedigrees, and reading a lot about the different lines, you start to recognized some of the physical characteristics of each line and get to know some of the naming schemes and kennel names from each line.
Titles are a clue, as you would most probably find conformation titles on show lines, and IPO/SchH titles on working lines, but they are not as reliable an indicator. A show line dog can earn working titles - and a working line dog may earn conformation titles - so going on titles alone can be confusing.
Gryffon Vom Wildhaus
BH, OB1, TR1, AD
Rottweiler/Hairy Dog mix?? 2004-2015