If you are sure your gsd is allergic to grains - the only effective long term solution is not to feed him any grains. I suggest you get a good grain free food and grain free treats and see how he does.
Read ALL labels carefully!
ACANA REGIONALS (grain free): Acana Regionals | Acana
Store locator: Store Locator | Acana
FROMM'S FOUR STAR (grain free): Four-Star Gourmet Recipes for dogs - Fromm Family Foods
Internet locator: Internet Retailers - Fromm Family Foods
Bravo Bonus Bites: are 100% all meat, and made from all natural, antibiotic-free, grain free meats and organ meat protein sources.
Example: "Dry Roasted" Buffalo Liver: Ingredients Grass-fed buffalo liver.
"Freeze Dried Treats" - Venison Liver: Ingredients Grass-fed venison liver.
Bravo Training Treats: Made from 100% muscle and organ meats and real Vermont Cheddar Cheese. Contain no grains, fillers or unnecessary additives of any kind. Perfectly sized to be held between two fingers for easy hand-to-dog feeding.
Example: "Turkey Bites" - Ingredients: Turkey thigh meat.
Example: "Trail Mix" - Contains the following - Ingredients: Turkey Bites: turkey meat Buffalo Bites: buffalo heart Hot Dogs: beef*, water, sea salt, celery juice and/or celery powder, sodium lactate, spices, Onion powder, garlic powder, paprika. *beef used was never administered antibiotics or growth hormones. Vermont Cheddar Cheese: Pasteurized milk, cheese cultures, salt, enzyme. Usually available at "Pet Supply Plus" chain stores. Find a location: Pet Supplies Plus : Home Page
The Honest Kitchen Treats Locate a store: Where to Buy Honest Kitchen - Honest Kitchen Stores | The Honest Kitchen
Beams: a natural dehydrated fish dog treat! They’re made from pure, wild-caught Atlantic Catfish* skins, from the clean ocean waters of Iceland, dried into savory, chewy sticks. They’re guaranteed to satisfy the pickiest of pups and are the perfect treat alternative to dried chicken snacks or bully sticks. Beams, like all our products, contain no Chinese ingredients!
Nuzzles: made with duck & cherries.
Home Made Eeazy Peezy Recipe:
Non Stick Fry Pan
Large Round Steak
Next time you go to the grocery store, pick up a nice size round steak, or top round.
Trim off all fat on the edges and in-between and if it has a round bone in it, remove that too.
Take a pair of scissors (outstanding tool for cutting meat) and cut the steak into manageable squares or rectangles.
Choose a fry pan (non stick works the easiest) that will hold the amount of steak you bought, and give the pan a small drop of oil or a quick spray of Pam.
Heat the pan until really hot and drop in the steak pieces in to sizzle. Keep your heat high but don’t leave the pan unattended.
Sprinkle on a little garlic powder or garlic salt.
Let it sizzle for about a minute or two then flip over. Braise the other side (pour off the juice if there is too much) and remove from pan when the middle is pink. Place on to paper towel, blot and let cool.
Take your scissors and cut all of the meat in strips about ¼” wide. Now take those strips and cut small pieces about the size of a ½ of a dime, (or whatever size you prefer).
Place small amounts into sealable snack baggies, then place those baggies into a sealable freezer baggie and place in freezer. On the day you are going to training, take out one or two baggies, place them in the frig and they will be unthawed by the time you are ready for class that evening. Of course the dogs love them frozen too, if you forget! They will unthaw quickly in your pocket.
You can also do the same with pork chops and calf’s liver. For calf’s liver, after it is unfrozen, soak up the excess blood with paper towel, and proceed starting with #3 as above (you won’t have to cut this first). Only braise the liver long enough on both sides (don’t thoroughly cook it) as it only needs to be cooked to a “medium” range, otherwise it will get crumbly. Drain the liquid during cooking if needed.
The process takes a little time but saves a lot of $$ and the dogs go crazy for them!