I wonder why you refuse to do the bland diet??
Getting Giardia is like sandpaper to your intestines; feeding a harsh (not to mention crappy) food such as royal canin only aggravates their stomach more and more!! Each time they eat a food that is not bland it is like rubbing sandpaper all over again; this results in a vast delay of the healing process.! They will never get better until you switch to a bland diet.

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I was feeding costco puppy as the first ingredient is Chicken, then chicken meal. The rest of the costco ingredients seem to be very good. Previoulsy, Innova, Blue buffalo and eukanuba did not work very well.
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These foods did not "work very well" because they are not BLAND!!!! I wonder why you are willing to try 4 different formulas of food, but not the bland diet

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Since my last post I have decided to use a different food. Wellness Simple Solutions with duck. The main 5 ingredients are duck, rice, and 3 different oils. I would suggest this to you, but obviously, you will not take the advice.

. Nisha will be on this food for 1 month so that her intestines have time to properly heal.
I wish you would do the same for your dogs; it
HURTS!!!! their tummies to be eating the food you are providing

. I really hope you change to the bland diet...poor dogs.
All Natural Dog Food - Simple Food Solutions - WELLNESSŪ here is a link, but it sounds like you refuse to try it :(