Couple of thoughts.
*Why didn't you go back to the Fromm's Fritatta if he didn't itch on it and did well?
*Did you try their other "Grain Free" varieties like the "Surf n Turf"?
*Have you thought about doing a partial raw diet? Such as using The Honest Kitchen Preference base mix to which you add your own fresh meat? 7# = $54 Makes 29 pounds
A grain-free, gluten-free foundation diet for use with added raw meat, meaty bones, or cooked meat. All Natural Dog Food - Dehydrated Pet Food | The Honest Kitchen
Hmmmm, Dr. Tim's food: in the top 6 ingredients there is only one meat source which makes it grain heavy.
Contains: DL-Methionine: Which is a lab made amino acid. Per Dr. Aldrich, a pet food industry advisor: The starting materials for production of DL methionine are acrolein (a 3-carbon aldehyde) derived from propylene (a petroleum derivative), methyl mercaptan derived from methanol and various sulfur sources and hydrocyanic acid (HCN).” Studies on rats have shown an increase in cancerous tumors from ingestion.
Canola Oil: The Weston A. Price Foundation article quotes numerous studies of the effects of Canola oil in animals; “These studies all point in the same direction--that canola oil is definitely not healthy for the cardiovascular system. Like rapeseed oil, its predecessor, canola oil is associated with fibrotic lesions of the heart. It also causes vitamin E deficiency, undesirable changes in the blood platelets and shortened life-span in stroke-prone rats when it was the only oil in the animals' diet. Furthermore, it seems to retard growth, which is why the FDA does not allow the use of canola oil in infant formula.” Journalist David Lawrence Dewey quotes research from the University of Florida that “determined that as muh as 4.6% of all the fatty acids in unrefined canola are ‘trans’ isomers (which are somewhat like plastic) due to the refining process.”
Just something for you to consider!