A vertical pedigree lists the full siblings of each dog in a pedigree. They may be from the same litter or from another breeding of the same parents. It is an invaluable tool for breeders if it shows info on health test results regarding congenital diseases of all included dogs as far as known.
Often health issues that are not recognizable through a standard pedigree become obvious when looking at the data of a vertical pedigree.
The following example shows for better readability only 2 health issues and 3 generations: