!!Grimmy
->Voiced by: Charlie Brill
[[quoteright:176:https://static.tvtropes.org/pmwiki/pub/images/grimmy_the_dawg_5719.PNG]]
The main character, Grimmy is an oddly colored Bull Terrier who belongs to Mother Goose, though she often refers to him a kid or a child.

* AdaptationalNiceGuy: In the animated series he's far less of a {{Jerkass}} and is usually portrayed as well-meaning or even heroic, even if he tends to make a mess of things.
* AnthropomorphicShift: Grimmy was much less humanoid when the strip began, and now talks in speech bubbles, as opposed to thought bubbles, like in ComicStrip/{{Garfield}}.
* CheshireCatGrin: Done very often and very stupidly.
* ConeOfShame: He had to wear it briefly.
* DeadpanSnarker: He's prone to casual sarcastic aside comments, whether they're appropriate for the situation or not.
* DumbBlonde: He's got yellow fur, and he's... [[DogsAreDumb not the brightest bulb]].
* FunnyAnimal
* GagNose
* JerkWithAHeartOfGold: He's often a jerk because he thinks it's funny. It shows through his CheshireCatGrin above.
* LargeHam: Grimmy is loud and expressive and is by far the character who [[ChewingTheScenery Chews The Scenery]] the most, to an impressive degree for a comic character.
* TalkingAnimal: At first he only talked through speech bubbles, but as the series advanced, he was promoted to this.

!!Mother Goose
->Voiced by: Mitzi [=McCall=]
[[quoteright:136:https://static.tvtropes.org/pmwiki/pub/images/grimmy_the_goose_3316.PNG]]
Grimmy, Attila, and Ralph's keeper, who refers to them all as her children. Strangely enough, she's a goose herself, who keeps dogs and cats as pets, which [[FurryConfusion still has many confused]].

* AlmightyMom: Her pets certainly view her this way,
* FurryConfusion: She's an anthropomorphic goose who has two pet dogs and one pet cat.
* LikeASonToMe: Grimmy, Attila, and Ralph, who all call her "Mom" and treat her like their mother. Grimmy and Attila even give her flowers on Mother's Day.
* NonMammalMammaries: Averted; she doesn't have any visible breasts.
* SpeciesSurname: Often referred to as Mz. Goose.

!!Attila
->Voiced by: Creator/GregBurson
[[quoteright:99:https://static.tvtropes.org/pmwiki/pub/images/grimmy_the_cat_9328.PNG]]
A purple cat who lives with Grimmy and Mother Goose.

* AnthropomorphicShift: Along with Grimmy, he underwent this as well.
* CatsAreMean: Downplayed. Attila is ''far'' less mean than Grimmy, and can almost come across as the dog's punching bag on occasion... but he has moments where he can be every bit as callous.
* FatAndSkinny: With Sumo the Cat. In the early days of the comic, Atilla himself was quite fat, but ArtEvolution kicked in and he slimmed down to the point where he's now the skinniest character in the comic.
* FunnyAnimal
* LovableCoward: Downplayed in the comic strip, where he can be timid and anxious as a contrast to the more upbeat Grimmy, but it isn't a major part of his personality. Very much played up in the animated series, where he's undergone some CharacterExaggeration and is a nervous wreck.
* OutOfFocus: He's still very much part of the main cast, but his role was drastically reduced after the introduction of Ralph.
* [[RealMenWearPink Real Men Are Pink]]
* TalkingAnimal: See Grimmy's above.
* VitriolicBestBuds: He and Grimmy have this dynamic. Sometimes they get along and hang out like best buds, sometimes they fight like nobody's business.

!!Ralph
[[quoteright:95:https://static.tvtropes.org/pmwiki/pub/images/grimmy_the_boston_terrier_3589.PNG]]
A Boston Terrier introduced to the strip in recent years. He lives with Mother Goose, Attila, and Grimmy.

* CharacterBlog: He has his own Website/{{Twitter}} [[https://twitter.com/ralphthetweeter account]]. It hasn't been updated since 2015 (the in-universe reason may be that he simply [[DogsAreDumb forgot that he had it]]), but the official website still links to it.
* {{Cloudcuckoolander}}: He manages to confuse "tai chi" and "chai tea," which makes for some... ''interesting'' tea ceremonies.
* DogsAreDumb: He's the first dog to really demonstrate this, as Grimmy is dumb, but when compared to Ralph...
* FunnyAnimal
* MurderByCremation: In one strip, Ralph cremates a possum who was supposedly dead, but his wife comes around asking where he is. Ralph tries to inform her that he had died, but she tells him that he was just playing possum.
* TooDumbToLive
* TalkingAnimal: Introduced after the promotion Grimmy and Attila had to speech bubbles, so he's been talking the whole time.
* TheWatson: Less inquisitive than many examples, but his role in ''many'' strips is just to be there as someone for Grimmy to talk to. Either he doesn't say or do anything, or he asks a question that allows Grimmy to deliver the strip's punchline.

!!Ham
->Voiced by: Creator/EddieDeezen
Mother Goose's neighbor before mysteriously diappearing.

* ChuckCunninghamSyndrome
* FurryConfusion: Along with Mother Goose.
* APigNamedPorkchop: He is named after ham, a.k.a the meat that comes from a pig.

!!Sumo the Cat
A cat who hangs out with Attila. Seemed to have disappeared until a 2011 story arc.

* ChuckCunninghamSyndrome: For a long time, but he came back.
* FatAndSkinny: With Attila.
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