Tiny is a Tyrannosaurus Rex that appeared in Meet the Robinsons that was briefly under the control of Bowler Hat Guy's Mini-Doris.
Meet the Robinsons
Tiny is a Tyrannosaurus that was brought under the control of the Mini-Doris that was remotely controlled by Bowler Hat Guy, who got the idea when seeing the Mini-Doris hovering over a dinosaur topiary on the grounds of Anderson Observatory. Wanting to keep it a surprise, he didn't inform Doris, who was planning on cutting the chandelier to get rid of Lewis, and was enraged by the blatantly obvious attack as opposed to her subtle actions. After a fight with the family and Bowler Hat Guy again being told by a controlled minion that his plans weren't thought through, the Tyrannosaurus is freed from Mini-Doris control and turns out to be a rather docile specimen. Even after Doris' actions are undone by the climax of the film and he should have been sent back as a result, Tiny still appears to see Lewis back off to the past, now a pet of the Robinson household.