i do not know either blue mountain or blue wilderness - unless the latter is blue buffalo wilderness, which is decently rated in various rankings. but there are other foods which try to emulate the names and looks of the better brands while not being good at all. check out the lists that have been posted under feeding.
what kibble you use could make a huge difference. blue buffalo, MERRICK, ORIJEN, ARCANA are some of the products favored by knowledgeable people here, but any high-rated [100+ on the saveourshepherds.com list, for example ] is probably a good start. using lesser quality kibble will result in health problems. royal canin canned foods come in a very low fat, low moisture formula that would be good to use with your ds for a week to adjust their systems on the assumption that no more infections exist
AS AN ASIDE re kibble: one of my rescues last year [ Xander ] i was told was a very picky eater - that i should just leave his food out and eventually he would take bits of it over time. he also had very loose stool. i was sent on my way and his with the remains of his food bag - some common [i.e., well-known ], low-quality kibble whose name i have now forgotten. in a couple hours, i confirmed the partial truth of what i was told. he would indeed not even sample his dinner. i assume eventually - faced with no alternative - he would take what he needed to to stay alive. i emptied his bowl and filled it with the KIWI PEAK air-dried food that i had brought for him. that food disappeared in seconds. Xander was the least picky eater i had ever known in a dog til then - grapefruit, melons, veggies, greens, supplements, etc - all were eagerly devoured by this pup. what he did not like were granules of bad bacteria with no nutritional value that were causing him intestinal discomfort to the extent that he would almost rather starve. he never showed a hint of being picky thereafter. did my best to try to slow his intake of food, but he had spent a few months starved of good nutrition.
as for treats, again i suspect Blue Mountain is trying to ride the coattails of blue buffalo.
i would drop the banana and yogurt treats and serve the real things: plain, unsweetened yogurt with fresh banana, apples, etc. [ tho as diversity, everything else quality-wise being equal, i do like in treats the idea of berries, herbs and veggies that they may not be getting otherwise.]
Holistic Health Extension ''natural dog treats'' [
http://www.vetschoice.com 1 800 992 9738 ] are my new main commercial treat and its 1st and main ingredient is FREE RANGE chicken --- and a 1 lb bag at pet shop was 5.99 [ relatively low compared to other acceptable products ] and the treats are already bite-sized! an exceptional treat for the money.
carrots also make good treats