Dobbin joins Preston on a season-long loan.
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"We've been watching him for a while and I've been really impressed by the way he plays, and it's clear to me from the conversations we've had that he's really excited about coming to us," Preston boss Paul Heckingbottom told the club's website.
"He's got great pedigree and he'll add another attacking threat to our team."
Dobbin also said: "I think the call with the manager really sold it to me. It's a great platform to be able to perform and I think it's got all the fundamentals I'll need to improve as a player.
"I think it really stood out to me in that sense and I think I can just really grow on and off the pitch here."