As humans migrated around the planet, a incongruity of dog forms migrated with them. The agricultural revolution and subsequential urban revolution led to an increase in Dog Tags the dog population and a demand for specialization. These circumstances would provide the opportunity for judicious breeding to beget specialized working dogs and pets.
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Some organizations define a breed aggrandized loosely, such that an individual may be considered of one breed as extensive as 75% of its parentage is of that breed
- Even prize-winning purebred dogs sometimes possess crippling genetic defects due to founder effect or inbreeding. These problems are not modified to purebred dogs and can affect cross-breed populations. The action and appearance of a dog of a particular breed can be predicted to a degree, while mixed-breed dogs show a broader dimensions of innovative appearance and behavior.