Our Golden Retriever loves these.

Yield 6 dozen

3-1/2 c. flour
2 c. whole wheat flour
1 c. rye flour
2 c. unprocessed wheat
1 c. corn meal
1/2 c. instant non-fat dry milk
3 TB salt
1 envelope dry yeast
1 ts. dry beef boullion
1/4 c. hot water
2 eggs beaten with 2 TB milk
3-1/2 c. chicken or beef broth

Combine first 7 ingred. (Thru salt). In separate bowl mix yeast, boullion, and hot water. Stir until yeast and boullion dissolve. Add egg mixture. Mix well. Add 2 cups broth and yeast mixture to flour mixture. Mix with hands until dough is stiff. If too stiff add more broth. Roll to 1/3 - 1/2" thickness. Cut into shapes or just bars. Place on greased cookie sheets. Bake until brown on edges. Turn off oven and leave overnight to harden. Temp 400 degrees, time 40 min. baking.
Until you're sure these are acceptable to your dog, you might want to do 1/2 recipe. Our dog loves these, but he loves everything but onions and cukes. I also have others if this doesn't do it. Good luck. Glad to help!