Otis (Son of the Mask)

Otis is Tim Avery's dog, a Jack Russell Terrier that wears a brown plain collar. He finds the mask washed up in a river and uses it when he gets very jealous of the baby, Alvey Avery, being considered as the favorite in the house. In the end, Otis comes to accept Alvey.

Why He Sucks

 * 1) Just like Tim, he serves as the replacement for Stanley Ipkiss's pet, Milo. And not only does he try so hard to be the new Milo only to miserably fail and instead feel like a flanderized version of Milo; who was once a lovable, adorable, faithful, talented, surprisingly intelligent, loyal, and very heroic pet to Stanley Ipkiss, but this version of Milo has become more of a blander downgrade of himself who, with the mask on, becomes a grotesque, two-faced, loud yet forgettable, mostly selfish, psychopathic, crazed, extremely malicious yet clumsy, and a 'comedically' accident-prone villain who comes up with a convoluted plan to get rid of the baby so he can be the center of attention. He manages to be an overall boring and painfully unfunny secondary character.
 * 2) * Unlike Milo, who uses his powers for good. Otis starts off as somewhat of an antagonist since he is jealous of the baby, Alvey, and plots constantly to get rid of him.
 * 3) His self-serving goal of getting rid of the baby to be the center of attention is incredibly petty, and it seemed vague from Otis's perspective as a regular dog since it was never hinted that he hated him until his subplot took place.
 * 4) If his plans didn't fail miserably, then it would essentially be him attempting to commit first-degree murder towards the baby and still causing property damage just to have all the attention for himself. Not only does this make him hard to root for as an "outcast" since Tim already showed how much he cares about Otis before Otis got the masked transformation, it's also way too dark and violent for the movie's PG-rated audience.
 * 5) Masked Otis seems to be an over-the-top rip-off of Tom from Tom & Jerry, Both Wile E. Coyote & Taz from Looney Tunes, and Muttley from Wacky Races/Dastardly and Muttley in Their Flying Machines. All at once.
 * 6) * Examples of this include having wild and rabid traits to make him look crazy & dangerous like his gibbering and hyperactivity (what Taz is), having underhanded plans that continually backfire on them in cartoonishly humiliating ways (what Wile E. Coyote & Tom Cat are known for; the latter being a pet no less!), and being a snickering/muttering dog who is on the side of evil (what Muttley is).
 * 7) Due to the previous pointer stated above, Otis overall, as a villain, is this film's canine embodiment of Claude Cat from Looney Tuness 1952-62 shorts by personality. Especially since they are both shameless rip-offs of well-executed villains who are depicted as overly mean-spirited pets that have malicious and selfish tendencies just to get all of the attention for themselves, even when it comes to being bullies towards them, yet they receive what's coming to them at the end in a humiliating way.
 * 8) Masked Otis's design is very ugly and beyond terrifying. Where his cartoonish design fits more in 2D animation, his CGI design is incredibly nightmarish due to his face design having abnormally sized eyes and teeth that make him look cartoony in a grotesque fashion.
 * 9) * In fact, Masked Otis's design looks a lot worse than Milo's cartoonish transformation in the first film.
 * 10) * In the scene when he gets blown up by dynamite, his ashy design looks downright horrifying.
 * 11) Masked Otis's ugliness aside, his bumbling hijinks make him out to be a typical Butt-Monkey. Especially since Otis's plans always backfire in the most forced and predictable ways by Alvey (who is practically the movie's Karma Houdini).
 * 12) There are many creepy scenes he contributes to, especially when his plans backfire in an over-exaggerated fashion, many of these include:
 * 13) * French kissing a real-life dog named Venus before giving the mask back to Tim.
 * 14) * The infamous scene where a trap that he set for the baby by placing a hook on the baby so it'd be flown back, which backfires on him since the baby deceived him and the hook snags him by the collar, causing his eyes to  literally pop out of his head and bounce on the floor while scrapping his nails onto the ground. 
 * 15) Whenever he gets hit, swung, or squished by anything during his physically destructive "humiliation scenes" made for the sole purpose of slapstick humor, all of his expressions and deformed physiques generally come off scary, creepy, and unsettling due to his ugly design, and how many close-ups he gets that looks too unnatural to get a good laugh.
 * 16) * Examples of this are when he gets crushed in a piano, goes through a vent which makes him crushed into a cube, almost getting shredded by the ceiling fan before being snagged on its blades, being dropped into tar, getting covered in chicken feathers, dragged underground, flattened, drowned, and then flattened again after spinning in a machine. All while his cries for dear life can be heard in the background. This doesn't make him any less creepy and pitiful than he already was.
 * 17) Bill Farmer made Masked Otis's voice sound very obnoxious and grating. The worst offenders to this are his acts of gibbering, yelling, wailing, and laughing.
 * 18) He serves little to nothing to the plot.
 * 19) * Aside from being a loyal pet to Tim, he solely exists to be the comic-relief antagonist for this one subplot he has, who then goes back to his usual self and only gives Tim the idea to make a "zany" cartoon based on the rivalry Otis had with Alvery.

Redeeming Qualities

 * 1) He can have some funny moments every now and then.
 * 2) Before and after Otis had the mask on, Otis as a regular dog is rather adorable and passable.
 * 3) Some viewers can find his CGI masked design out to be awesome looking.
 * 4) * His animated 2D design is a whole lot more appealing than his CGI counterpart.
 * 5) At least he isn't as bad as Tim Avery. Especially since he does become on good terms with Alvey at the end of the movie since Tim convinced him to be good since Alvey will be his best friend in return.
 * 6) Richard Steven Horvitz does a decent job at voicing Otis as his more realistic counterpart.

Videos
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Trivia

 * He bears a striking resemblance to Milo from the first film.
 * His name is a take-off from the movie Milo and Otis.