Dory's response to soy is very much like an anaphelactic shock kind of response...heavy panting as if she can't breath, rubbing herself on the carpeting as if she itches, licking the carpet excessively...she is just not herself. I haven't had to rush her to the vet because when I realized what was happening i quickly analyzed her food ingredients and narrowed it down to soy in one of their treats...meaning she didn't get enough of it to create a big problem. I treated her right away with plain yogurt and water and then stayed up with her through the night and she seemed to get past it...i did talk to her vet the morning after to touch base and confirm what i was doing was on the right track. She got soy another time and had the same response...it's a bit scary so now I just don't let her have anything with soy and really don't let people feed her anything (i have a well-intentioned roommate who is no longer allowed to give her anything without asking).
My vet is a wonderful guy... i met him while i was doing chemo and my dogs would both get sick every three weeks when i had my treatment....i would have a treatment and then they would start having bloody diarrhea the next day. We got them through that and they really haven't been sick since...i felt so bad that they were so in tune with me that they got sick too. Dory was only 8 months old when i got diagnosed, so we were still working out her fitting into the family, and it took a while for me to figure out their food. Disney, my little guy, has always been a picky eater and i really didn't want them on two different types of food. we have tried royal canin and other high-end foods but have settled for Halo small breed chicken spots stew as a baseline for them both. They both seem to do well on it and I can then tailor each of their meals to suit their individual needs...Disney needs higher calories and is a senior at 10 so he gets a different blend of halo mixed into his called vigor...it has venison and salmon and the picky boy really likes the flavor. Dory needs lower calories and various supplements for her anal glands and weight management, so she gets pumpkin mixed in with hers which gives her extra fiber and aids in keeping her weight under control. halo also makes a small breed turkey duck and pheasant flavor that they can both have as their base food...my dogs do well on poultry and that helps with dory's weight. Halo also has a variety of supplements which really help my dogs with their joints as both of them have leg issues. They also have a chicken protein powder that i can use to beef up Disney's food as needed.
I will say that having dory around has made him a better eater...competition helps, i guess, although mealtime is something that i have to take timeout for or he would let her bully him into giving up his dinner. Dory is not picky at all...i could put gravy on cardboard and she would act like its gourmet.
What really helped me was finding a base food that they could both have and then tweaking it for each of their needs. When i had to figure all this out i had cancer so i couldn't cope with different foods all the time for them...it drove me nuts to be honest. The Halo line worked out for us and is available in most petco stores and i try to get it on a big sale a few times a year to save money. It is vacuum sealed and living in MI I like to keep extra food on hand in case we are really snowed in. I like that it has never been recalled...i know i sound like an advertiser but this line of food and supplements really saved us here. I am not rich but with good sales and planning i can do this and their last blood work came back excellent so I feel pretty good about what i am doing. Whatever you decide about food, try to keep it simple for you and affordable...i like that i can easily get this food whether i am at home or traveling too.
wow...long post...hopefully that answers your questions and gives you a little food for thought, so to speak
have a nice day