I’m not a vet, but can share what I do with my dogs when they (very occasionally) suffer from that.

 I’m not a vet, but can share what I do with my dogs when they (very occasionally) suffer from that. First, feed them only easily digested food; my choice was rice porridge made with chicken broth. To the first such feeding, mix in some nutritional charcoal (you can find them in just about any nutrition store or section of a drug store); I get the charcoal tablets which makes it easy to administer the dose (for my dogs at 50lbs, this was one or two capsules worth). Charcoal cleans out the GI tract; it is indiscriminate so next meals, follow with probiotics mixed into the food (let the food cool down else the probiotics get killed out in hot or warm food). Give your dog at least a couple days of just the porridge and probiotics then the D should have gotten resolved. (You can start adding in some regular food into the porridge and see what his BM looks like as a result.) On-going D is a worry for if you try my approach and it doesn’t work, or your dog starts displaying other or more discomfort, rush to the Vet. These are the practices I’ve applied with my dogs (though I’ve never had to do the “rush to the Vet” part thankfully). In all of this, of course, be mindful of what your dog is consuming. Good luck to you both.

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