Dogby Walks Alone

Official English: INKR

From Tokyo Pop (based on volume 1):

When a rival theme park engineers a plot to steal a week's worth of revenue from HappyPlace, the plot seems to go all the way to the top, and it may even involve...murder! In the ensuing frenzy, Dogby--a man in a dog suit--learns of the death of his beloved queen and embarks on an adventurous trek to find the murderer and bring him to justice. To expose corruption in the HappyPlace theme park, Dogby will have his day!

NOTE: According to Wikipedia, 3 volumes were written, though only 2 was ever published.