Now if Raider has had vomiting with a harsh cough, we have 2 considerations. We may have nausea leading to the vomiting with a secondary inflammation of the throat then triggering the cough. Or we could have an upper airway infection leading him to coughing his throat raw and thus making him prone to vomiting due to throat sensitization. Therefore, our main suspects with his signs would be a possible bacterial or viral gastroenteritis, pancreatitis, parasites/protozoa infections, dietary indiscretion, or upper airway infection.
With this all in mind, we can try some home supportive care to try to settle him. To start, you can consider treating him an OTC pet safe antacid [ie Pepcid (More Info/Dose @http://www.petplace.com/article/drug-library/library/over-the-counter/famotidine-pepcid), Zantac (More Info/Dose @ http://www.petplace.com/article/drug-library/library/over-the-counter/ranitidine-hcl-zantac)]. Alternatively, since we have some throat irritation/inflammation concerns, we could use a liquid antacid (ie Milk of Magnesia 0.5tsp every 12 hours) Whichever you choose, we’d give this 20 minutes before offering food to allow absorption. Of course, do double check with your vet if he has a known health issues or is on any medications you haven't mentioned. Though if he cannot keep it down due to nausea, that is usually a red flag that we need to bypass his mouth with injectable anti-vomiting medication from his vet.
Afterwards, if he is weak and lethargic, we can try boosting his blood sugar by rubbing a sugary syrup (ie glucose syrup, honey, karo syrup, pancake syrup, or even non-grape jam) onto the gums. This will get some sugar into his and hopefully perk him up for us. Then once the antacid has kicked in, you can consider starting an easily digestible and soft diet like cooked white rice with boiled chicken, boiled white fish, cottage cheese, scrambled eggs, or meat baby food (as long as its garlic/onion free). The aim of these diets is that they will be better tolerated/absorbed by the compromised gut. Therefore, it should get more nutrients in and result in less GI upset. As long as improvement is being seen, I usually advise continuing this until signs are settled, and then weaning slowly back to your normal diet.
Finally, as dehydration is a risk here, we need to keep an eye on his hydration. To check that he isn't dehydrated, there are a few things you can test. Further to checking for gum moisture, do make sure he doesn’t have sunken eyes and that he doesn’t have a "skin tent" when you lift the skin. To see how to check these parameters for dehydration, you can find a good video HERE (http://www.ehow.com/video_12232503_dog-dehydrated.html). If you are seeing any signs of dehydration already, then that would be our cue to have him seen before this becomes an additional issue (especially as it is often dehydration that makes them feel unwell).
Overall, his signs do raise some concerns here. Therefore, we’d want to start supportive care to settle his stomach. If he cannot keep that or water down at any point, appears dehydrated already, or doesn’t respond to the above within 12-24 hours; then we'd want to get his vet involved. They can assess his hydration, listen to his airway/lungs, make sure there is nothing in his stomach that shouldn't be there or any sinister viruses present. Depending on their findings, his vet can treat him with injectable anti-nausea medication, antibiotics +/- dog safe anti-inflammatories to nip this in the bud. Kind regards,
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