A. Diarrhea can cause straining, and often seeing them trying to pass stool often looks just like a dog with constipation. Diarrhea has many causes, including parasites, bacterial or viral infections, eating something that doesn't agree with them, and liver and kidney problems. If he's normal otherwise you can try a bland diet composed of white meat chicken (boiled, no seasonings) and white rice (boiled, no seasonings) mixed 25%:75%. Feed in small, frequent feedings (1/2 cup every 2 - 3 hours). If he's still having diarrhea in 12 hours take him in for exam and treatment at your vet.
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