What is the name of Bluey's bossy blue heeler cousin?

Bluey’s bossy blue heeler cousin is Muffin.

Muffin Cupcake Heeler is Bluey and Bingo’s cousin and the daughter of Stripe and Trixie. She is three years old in the series and is known for being outspoken, impatient, and prone to dramatic tantrums. Her forceful personality often makes her appear bossy during games.

Muffin’s behavior is a source of comedy, but it also reflects her age. She does not always understand turn-taking or compromise, and the adults frequently have to help the cousins manage conflicts. Episodes such as “Library” and “Faceytalk” give her especially prominent roles.

Muffin is a Blue Heeler, like Bluey, while her younger sister Socks is also part of the same cousin group. The alternatives are different characters: Jack is a Jack Russell Terrier, Rusty is an Australian Kelpie, and Socks is Muffin’s younger sister.