While dark chocolate is dangerous for dogs, we'd not expect that to be a factor here.
Now as long as you are sure that he couldn't have eaten anything harmful (since that is usually what makes a case urgent), we can tread with care at the moment and consider some supportive care. Of course, if he continues to groan (which raises concerns of belly discomfort), then we may need him seen sooner.
Now in regards ***** ***** care at the moment, you can consider trying him with an antacid. There are a number of antacids that are available over the counter and pet friendly. I would advise only treating with one, but the ones I tend to recommend are:
*Pepcid (More Info/Dose @ http://www.petplace.com/article/drug-library/library/over-the-counter/famotidine-pepcid)
* Tagamet (More Info/Dose Here @ http://www.petplace.com/article/drug-library/library/over-the-counter/cimetidine-hcl-tagamet)
*Zantac (More Info/Dose @http://www.petplace.com/article/drug-library/library/over-the-counter/ranitidine-hcl-zantac
We tend to want to use these 20 minutes before offering food to allow it to take effect. And of course, if he is has any pre-existing issues or is on any other medications that you haven't noted, you'd want to check with his vet before using these.
Once that has had time to absorb, you can consider tempting him with a light/easily digestible diet. If you do so, start with a small volume (a spoonful) to start. Examples would be cooked white rice with boiled chicken, boiled white fish, or scrambled eggs (made with water and not milk).There are also veterinary prescription diets that can be used (ie Hill’s I/D or Royal Canin’s sensitivity). When you offer that spoonful, give him 30 minutes to settle. If he keeps the food down, you can give a bit more and so on. As his tummy stabilizes, you can offer more. The aim of the easily digestible diet is that it will be better tolerated and absorbed by the compromised gut. Therefore, it should get more nutrients in and result in less GI upset and diarrhea. As long as improvement is being seen, I usually advise that the diet be continued until the GI upset is settled, and then slowly wean back to his normal diet over a week.
Finally, there are some anti-diarrheals that can be used in dogs to slow things down for their gut if his stools are very runny. As I am sure you appreciate, these would not be a cure but would slow the diarrhea to aid the body potentially absorb more water/nutrients then it would have if the diarrhea were unchecked. Furthermore, these treatments will coat the GI and could just settle the GI upset. In regards ***** ***** options for your wee one, the one we most commonly use in dogs is Kaolin/Kaopectate (More Info/Dose @http://www.petplace.com/article/drug-library/library/over-the-counter/kaolin-and-pectin-kapectolin-k-p). This is available from your local pharmacy. Furthermore, Propectalin, Fast Balance, or Protexin Pro-Fiber( which are all available OTC at vets, pet stores, and even Amazon) would be another option. All will slow diarrhea and the last 2 have the bonus of providing support to the delicate good bacteria of the GI. But of course, before any of these, we want to address that nausea and vomiting.
Overall, your lad's signs do suggest GI upset targeting the intestines and the stomach together. Therefore, as long as he has had no access to anything toxic or non-edible, you can take the above steps to settle his stomach and monitor him closely. If you initiate these treatments now but he continues to groan, then we'd want him seen at this point. Otherwise, if we can settle his stomach, you can wait for his regular vet to open. Once they do, they can have a feel of his belly for sinister lumps and bumps or anything that doesn't belong. Depending on their findings, they will be able to treat him with antibiotics against bacterial gastroenteritis and anti-nausea medication by injection to help settle his stomach to get him back on track as quick as possible.
I hope this information is helpful.
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All the best,
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