Early in his life, Dozer was best friends with a female Dozeratops named Blayde, until their herd was attacked by D-Structs. The incident left Blayde angry and bitter, and she soon turned to bullying other Trux, putting an end to her friendship with Dozer. Dozer proved less aggressive, though he still proved more than willing to take on another Tyrannosaurus Trux upon spotting Ty Rux in The Crater. The confrontation resulted in Dozer falling into a tar pit, form which he was saved by the unexpected cooperation of Ty, Skya the Craneosaur, Ton Ton the Ankylodump, and Revvit the Reptool. This collaboration and the resulting building that took place proved to be the first of many, with Dozer overcoming his own sentiments to join the unlikely new community.
When the group welcomed additional Reptools into their midst, Dozer formed a bond with the similarly cantankerous Waldo; working together with the others, they built a new home, The Garage.
Dozer is an aggressive, cantankerous figure who tends to smash first and ask questions later, it at all. His grumpy attitude led him to bond with the similarly tempered Waldo, but also causes him to clash with or be easily annoyed by his fellow Trux, most commonly Skya and Ton-Ton. Despite his gruffness, Dozer does have a good heart and a softer side to his personality, as shown by his friendships and particularly his father-like affection for the Tortools. While he was once friends with Blayde, he chose to rise above the bitterness that stemmed from the shared tragedy of their past, and after their initial reunion he hasn't hesitated to face off with her.