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Hello, this is Dr. Jess. I am sorry to hear about your dog! Most likely the straining was due to the irritation of her colon due to the diarrhea. Sometimes dogs who are having a severe bout of diarrhea will experience the feeling that they have to have a bowel movement but nothing will come out because they have already pooped everything out!
Is your dog still energetic? Does she seem weak at all? Any vomiting? If you look at her gums are they pink and moist?