First, if Barkley is that young, we do want to tread with care. Young dogs are very delicate and can become dehydratied and experience low blood sugar secondary to profuse vomiting. In any case, based on his sudden signs, we do have a significant upper GI upset. Now these signs can be triggered by a range of culprits at his age. Common causes include viral or bacterial gastroenteritis, parasites, pancreatitis, dietary indiscretion (if he ate a lot of dirt when digging), sensitive stomachs, toxins and foreign bodies.
Now as long as you are sure that he couldn't have gotten into anything harmful (toxic or non-edible), we can try to settle his stomach at this stage. Of course, I do have to warn you that if he is struggling to keep water down, then that can be a sign that we will need injectable treatment from his vet to bypass his mouth/stomach and get him settled. Still, if you wanted to try and soothe his stomach, there are some options you can use.
To start, if he has just vomited, then we'd want to rest his stomach for a few hours. Water can be offered but just in small sips or as ice cubes since over drinking will also trigger vomiting. At this time, if he seems weak at all, you can try to boost his blood sugar by rubbing a high sugar solution (ie Karo syrup, honey, pancake syrup, etc) on his gums. Once he is more settled, you can then try 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 know health 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). Examples would be cooked white rice with boiled chicken, boiled white fish, cottage cheese, 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. As long as he is settling, we can continue the diet until he is 100% and then slowly wean him back to his usual foods.
Just to note, since dehydration is a risk here, we need to keep an eye on his hydration. To check his hydration status, there are a few things we can test at home. One is whether the eyes appear sunken, if the gums are tacky instead of wet/moist (a bit of a concern from your photo), and whether he has a"skin tent" when you lift the skin. To see how to check these parameters for dehydration, you can find a wee video on this HERE. If you are seeing any signs of dehydration already, then you do want to have him seen by the vet before this becomes an additional issue for him. (since it is often the dehydration that starts to tap their energy level, depresses them, and makes them feel ill).
Overall, if he is vomitng profusely, then we need to tread with care. It would be ideal to have him seen, as those gums do look to be showing early stage dehydration already. That said, if he can at least keep water down for a wee bit, then you could choose to use the above to at least try to soothe his stomach and halt that vomiting. Of course, if he didn't settle, then injectable anti-vomiting medication +/- antibiotics from his vet would be indicated to help get Barkley feeling like himself.
I hope this information is helpful.
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All the best,
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