Stage 5: Full Anthro.
Infected in this stage completely give up on wearing clothing having transformed into fully anthropomorphized canines. Infected usually give completely into their new instincts however maintain their human intelligence usually. They also have a growing desire to infect others by any means necessary.
Stage 6: Final Form.
Infected in this stage no longer resemble humans having been fully transformed into canines. They tend to retain human level intelligence but almost never remember being human to begin with. The canine instincts are now all consuming and they want to infect any uninfected humans.
You can become:
a dog
a fox
or
a wolf
(to name a few).