Also Read: 10 Reasons Why Do Dogs Eat Poop? Causes Of Acute Diarrhea. So, what is acute Diarrhea, and what are its causes? Acute Diarrhea is a relatively common occurrence, usually prompted by some food in your dogs intestinal tract. Most of the time, the signs will go away on their own, and their health will return to normal without you having to do anything. However, sometimes its essential to contact your vet. Causes Of Acute Diarrhea in Dogs. Well, generally, there are four reasons ...