Welcome! I am Dr. Altman, a licensed veterinarian and happy to answer your questions today.
I am so sorry that your dog is showing signs of IBD. There are many causes of IBD including food allergy, immune mediated causes, or unknown. Depending on the cause the treatment may vary:
If it is food related then a hypoallergenic
diet is advised such as hill's z/d ultra or royal canin h/p formula. When eating this food dogs cannot have ANYTHING else and if this is a food allergy as a cause often the stool will normalize within a 1-2 week period (sometimes supplements or antibiotics are warranted to treat the other issues associated with IBD such as the bacterial flora being off balance or clostridia to name a few)
When it is immune mediated the treatment is going to often be steroids and another medication (azathioprine or cyclosporine to name a few) until the signs are reduced, weight is maintained, and hopefully stools normalize then SLOW tapering of medications over months to find the lowest effective dose of medication to control symptoms.
Ideal is going to be an intestinal biopsy to rule this out as a possibility but if this is not a viable option the food trial is an alternative. Dogs food allergy is primarily to the meat versus common thought that it is the grain. So these foods are formulated so that the protein is broken down beyond the point of the body recognizing the protein and therefore will not react to the food. My dog is on one of these diets and if she gets anything outside of the regular food she will break with diarrhea. In fact, she had a greenie two weeks ago and has had loose stool since! She is on antibiotics and probiotics and we have yet to control her symptoms again from her one greenie!
I hope this information makes sense but please let me know how else I can assist you both today
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