Wow that's a lot of good stuff to be alergic too. I juice as well, and know the drooling pup waiting for their fruits and veggies.
Grapes are another definite no as well as onions and definately no garlic from the juicer. Very small amounts of garlic are ok but a few cloves in the pulp would be very bad.
Beyond that, we aware of greens, not that they are bad, but like kale, spinach, broccoli can make for a very gassy dog and maybe some upset tummy.
However Carrots, celery, those things are great for dogs. When I juice I break a hunk off a carrot and slice off an apple. Peaches, pears are great. Citrus fruits like oranges, limes and lemons should be moderate. Some dogs don't like citrus but Hemi will eat a whole orange or lemon of I let him. Watermelon as well. Pretty much all your berries are good too, blueberries, strawberries, black berries etc. I really think Hemi's favorite treat in the whole world is strawberries.
A book I got a while ago that might help is Dog-Gone Good Cuisine: More Healthy, Fast, and Easy Recipes for You and Your Pooch: Gayle Pruitt, Joe Grisham: 9781250037138: Amazon.com: Books it has a ton of health recipes for you and your dog and an entire chapter on juicing recipes you can share. In the summer I make Hemi his own juice then freeze them into ice cubes to make for a great summer snack outside.
On a side note, too bad he is allergic to sweet potatoes I recently found an awesome recipe.
Peach or Pear Delight:
1 sweet potato,
1 1/3 cups of blueberries
2 peaches or 2 pears
1 apple
dash of cinnamon.
Hemi can have this one as well.