Uni didn't like apple at first either. I think it's the skin. Try a sweeter apple like a Fuji. Or try green beans, watermelon, blueberries, baby carrots, bean sprouts. Since he's overweight and you have him on a diet I'm surprised he's not taking anything you give him. When I was fostering Katie, I thought she needed to lose a few, and she would eat any fruit or veggie I would give her. She would even eat plain old lettuce. I say call the vet. I doubt they will tell her.
Keep walking him, you're doing a good job. Maybe take out your pack first, then come back for him and go slower. Baby steps. What is his name btw?
__________________  The T.U.B. Pack! Toto, Uni, & Bindi
RIP Lord Scrappington Montgomery McLimpybottom aka El Lenguo the Handicapped Ninja 10-12-12 
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