Yes you can, or I'd prefer to give pedialyte that is used for babies when they are dehydrated, doesn't have all the sugar.
Can I Give My Dog Gatorade For Diarrhea?
If your dog has diarrhea and is not eating you need to see a vet as soon as possible. If he is eating you can try imodium (pill form) large dog (60lbs) one pill. Smaller dogs try 1/2 pill. Do not use Pepto Bismol. You can also try bland diet of chicken & rice or plain baked potato. Gatorade contains salt so I would give him very little.You could give him chicken broth w/ water to get him to drink if he won't.
Give your dog pedialyte with a little chicken broth in it so it wont dehydrate and take it to the vet