"At first sight, Poochyena takes a bite at anything that moves. Poochyena is an omnivore—it will eat anything. This Pokémon chases after prey until the victim becomes exhausted. A distinguishing feature is how large its fangs are compared to its body. This Pokémon tries to intimidate its foes by making the hair on its tail bristle out."
When Lexi came to the Kalos Ranch, she found out that her mother and Poochyena had bonded a lot, and so, she decided that, while still under her ownership, Poochyena would live with her mother full time.
Poochyena has Hyperosmia; the ability of an acute sense of smell, allowing it to track people, Pokémon and objects after just one sniff. Its able to chase tenaciously.