First, we can see increased thirst for a range of reasons. It can be a nausea sign (as is his appetite loss), secondary to inflammatory disease or systemic disease (ie organ troubles, metabolic imbalances) but also could be triggered by him eating something dry and mineral ***** *****ke cat litter. So, even though the garbage isn't likely an issue (with the time frame and the contents), we have a few concerns and need to tread with care.
Now if we potentially have something like litter in his gut that could be unbalancing his normal fluid/electrolyte balance, then we need to keep a close eye on him. Now the weakness is a concern, but if you see signs of dehydration, then we’d be concerned that this is our culprit and we’d want him seen urgently. To check that dehydration isn’t an issue, there are a few parameters you can test. Further to checking for gum moisture, you will want to make sure his eyes are not looking sunken and that he doesn’t have a "skin tent" when you lift the skin. To see how to check these, you can find a good video HERE (http://www.ehow.com/video_12232503_dog-dehydrated.html). If he has a normal hydration, then you can let him controlled access to water (ie 1/2c every hour) as we let the body absorb and pass that excess belly distending fluid.
Though if his hydration is normal and he didn't have much, then we can also try to counter any nausea. To do so, you can consider treating with an OTC pet safe antacid like Pepcid (More Info/Dose @http://www.petplace.com/article/drug-library/library/over-the-counter/famotidine-pepcid) or Zantac (More Info/Dose @ http://www.petplace.com/article/drug-library/library/over-the-counter/ranitidine-hcl-zantac). 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. Also if you give this and 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.
Once he is more settled, you can plan to try small meals of a light/easily digestible diet. Examples you can use are cooked white rice with boiled chicken, boiled white fish, or scrambled eggs, or meat baby food (garlic/onion free only). 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 well, you can add fiber (ie canned pumpkin, all bran) to these meals to help push any litter through the gut.
Of course, we carry out the above, we’d want to be keeping a close general eye on him. Since we have a possible gut blockage concern with what he may have eaten, we’d want to make sure we see no signs of belly discomfort, paling gums, restlessness, straining to pass stool (especially black stool since that is a sign of a gut bleed) or vomiting.
Overall, we need to be very careful here with King. His sudden signs raise some serious worries. Therefore, we want to monitor him closely, check those parameters I noted, and start supportive care. Though 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 him, potentially check bloods if a systemic issue is suspect after their exam, and determine which of the above is present. Depending on their findings, his vet can treat with injectable anti-nausea medication, fluids, +/- antibiotics to settle his stomach and get him back feeling like himself.
Please take care,
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