an imbalance in the ratio of Omega-6 to Omega-3 is not an "allergy".
By & large, food-purists & nutritionists are probly aware that there IS a preferred ratio; the vast majority of pet-owners are unlikely to have even the faintest glimmer, unless it's something they are concerned for, in their own diets, & then consider in their pets' diets.
Frankly, i consider it a very far reach, & if it's so worrisome, adding fish-oil or krill-oil as a supplement is pretty simple.
If U want to avoid feeding CAFO meats, by all means, find a local farmer who raises pasture-fed & silage-fed, or feeds orchard grass hay or alfalfa & swedes or whatever, & buy theirs - CSAs are an excellent idea, & buying local is a good thing.
But i just can't get exercised about Omega imbalances - it begins to sound as if the dog's chakras need rebalancing, it's becoming a matter for choosing which crystals to use in his healing.
I don't recall reading about specific SYMPTOMS the dog actually has, other than a vague reference to 'allergies'.
Does he itch, break out in a rash, develop hives, have recurrent diarrhea, vomit shortly after eating the suspect food/s, have recurrent EAR infections, lick his paws raw, ___________ ?
Has he had repeat aural haemotomas?