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Disney president John Lasseter made the announcement at a Disney Animation Showcase in London today, reports Empire.
Dalton's character will be Mr Pricklepants, who is described as a "hedgehog toy with thespian tendencies".
Last month, it was revealed that Michael Keaton would be voicing Barbie's boyfriend Ken in the third adventure from the children's animated franchise.
Lasseter first revealed Disney's Toy Story 3 plans in January 2008, claiming that people would be "blown away" by the project. "[It] is shaping up to be another great adventure for Buzz, Woody and the gang from Andy's room," he said.
Toy Story 3 is scheduled for release in June 2010.
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