Hi there I'm Dr Goodall and I'd like to help
The most common cause of abdominal pain and gas in dogs is colitis.
This is inflammation of the intestinal lining (a tummy bug) and is usually caused by eating/licking something nasty such as cleaning themselves after getting dirty outside, eating animal feces or a bit of rotten food, or even can be just due to a change in diet. It may well be that Beau develops vomiting and/or diarrhea soon.
The treatment for simple enteritis is as follows:
1) Feed only boiled chicken rice in small amounts for the next couple of days. Once he seems better, gradually introduce the normal dog food back in with the chicken and rice over a few more days. There is no need to starve him unless he starts to vomit.
2) You can try giving him 0.5ml per pound body weight of pepto-bismol twice daily.
3) You can also try adding in some plain live yogurt to stimulate the ‘good’ bacteria (they will then fight off the infections caused by ‘bad’ bacteria). Only add in small amounts at first because sometimes dairy products can cause diarrhea.
4) I’d advise worming him to rule out intestinal worms as a cause.
Colitis can take up to 2 weeks to resolve, but usually the above treatment is all that is needed.
However, if Beau starts to have diarrhea which becomes very bloody (brown diarrhea is ok as long as he remains bright in himself), if he starts to vomit and becomes dull and lethargic then I would recommend taking him to a vet. Dehydration is the worry with colitis, and sometimes in severe cases dogs require intravenous fluids and antibiotics.
Hope this helps, if you have any questions please just ask!