Thank you again,
I am glad to hear that his gums are normal for him. Though I would note that if Buddy has been drinking more for that length of time, that suggest a chronic issue. At his age, we'd have to be wary of possible metabolic issues (ie diabetes, Cushing's disease, Addisons, etc) or even organ dysfunction (ie kidney, heart, liver, etc). And I do have to warn that that may be why he is losing weight as much as these GI signs which could be secondary to this underlying issue or a non-related gut infection or dietary indiscretion while you are away.
Therefore, with this all in mind, we need to try to settle his stomach but we will also need to look into that bigger longer term ongoing issue behind his thirst and accidents (which are likely related to his bladder not being used to the increased fluid intake). Now in regards ***** ***** his stomach, we can start 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 Tagamet (More Info/Dose Here @ http://www.petplace.com/article/drug-library/library/over-the-counter/cimetidine-hcl-tagamet). 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 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 that has had time to absorb and he is steadier on his stomach, we can start a light/easily digestible diet. Examples you can use are cooked white rice with boiled chicken, boiled white fish, cottage cheese, or scrambled eggs. 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 the signs are settled, and then weaning him slowly back to his normal diet.
Since you did report dry gums and we can see dehydration in dogs with increased thirst/urination (since they tend to have fluid imbalances), we need to keep an eye on his hydration. To check this and ensure he’s not becoming dehydrated, there are a few things you can test. Further to checking for gum moisture, you will want to make sure Buddy's 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 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 for him (especially as it is often dehydration that makes them feel unwell).
Overall, there are a wide range of agents could trigger his GI signs, but Buddy sounds to have more ongoing in this situation. In fact, I suspect there is an organ or metabolic issue underlying that has caused those other signs for the past 2 months. And it may be that coming to a head or the added stress of you being away that has allowed an opportunistic GI infection to take root. 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 once his vet is open, we'd want him seen. They can assess his hydration, make sure there is nothing in his stomach that shouldn't be there or any sinister viruses present. As well, they can check a blood and/or urine sample to determine what is causing those longer term signs. Depending on their findings, his vet can treat him with injectable anti-vomiting medication +/- antibiotics to settle his stomach but also address that underlying issue to help get him generally back to himself.
Please take care,
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