Dog Stereotype: Kishu are known for being headstrong, strong-willed hunting dogs. Hanako does display the loyalty and devotion associated with Kishu, but she's a playful cloudcuckoolander who couldn't hurt a fly.
Trademark Favorite Food: She adores melons and especially loves melon pan most of all (which she thinks is actually made of melons).
Sora
Dog Stereotype: Subverted. She isn't the cuddly, awkward Dachshund of pop culture, but instead she acts more similar to how Dachshunds actually behave.
Masculine Girl, Feminine Boy: She's tough, mean, and athletic while her crush Sebastian is a cute and sensitive Yorkie. For emphasis, she wears a blue collar while Sebastian wears a pink hair bow.
Sebastian
Dude Looks Like a Lady: He's small, cute, has a high-pitched feminine voice, and wears a bow on his head.
Uncatty Resemblance: Subverted as a plot point. His owner is masculine, aloof, and a bit of a jerk. The dogs thought that he was Sora's owner, not Sebastian's.
Unintentionally inverted in practice. Even though he's supposed to have English as his first language, in the anime it's quite clear that his voice actor can't quite pull it off, using "me" where an English-speaker would say "I" (possibly a translation hiccup, see Japanese Pronouns below), and pronounces "white lady" as "hwite rady."
Betty and Veronica: He's the Veronica to Mametarou's Betty. He's rich, haughty, and sophisticated.
Brits Love Tea: He's shown drinking tea as a gag in episode 7, fitting British stereotypes.
Gratuitous English: He's from England and sprinkles his speech with English.
Japanese Pronouns: He uses "me", showing his difficulties with Japanese.
Trophy Child: Jack is a Rough Collie stud who is treated like an object by his owner.
Gen
The Big Guy: The largest dog in the cast, being a huge Siberian Husky.
Gentle Giant: He's a sweet Husky and the largest of the cast (even more so than Hanako).
The Stoic: Calm, gentle, and soft-spoken despite having a very deep voice.
Unsuccessful Pet Adoption: He’s on the receiving end of this trope. Ever since he was a puppy, his owner loved him and played a lot with him. But she was a little kid at the time she adopted Gen, and eventually admitted she knew huskies are energetic but got him without the knowing full knowledge on the breed. As Gen got older, bigger, and more energetic, he became too much to handle for his owner. Gen is eventually given away to a new home in Hokkaido because his owner believed what Gen wanted is to have a home with as much space and to run around without restrictions. But on Gen’s point of view, what he truly wanted was more of his owner’s love and attention.