Sparkplug (robot dog)

From Teletraan I: The Transformers Wiki

Sparkplug is an automaton from the Transformers Animated franchise

Sparkplug, also known as Sparky, is Sari's robotic pet dog. He likes to chew on Sari's key. Transform and Roll Out! According to Professor Sumdac, he built Sparkplug as a gift for Sari on her birthday.

He hasn't been seen much since Sari took an interest in much cooler robots. Luckily for him, Isaac still loves him. Sound and Fury

He was decidedly less cute once Henry Masterson got his grubby gamer mitts on him. The Return of the Headmaster

He is of course entirely distinct from the human miner in Professor Sumdac's employ that strongly resembles a certain other Sparkplug.