This sounds very concerning. His symptoms are vague (not eating
, possible fever, vomiting) and could reflect one of many possible underlying conditions ranging from ingestion of unusual item that is trapped in his digestive tract to organ issue (liver, kidney) to pancreatitis
to infectious disease (viral, bacterial, fungal) and the list continues.
To try to narrow down that list will require an exam by his vet and some testing that might include a CBC, chemistry profile, urine check +/- radiographs (X-rays).
I regret that I cannot be more specific for you with a diagnosis, but I too would need to perform the exam and some testing to be able to know what's troubling Diesl.
Since he has not improved I really must recommend you have him seen by his veterinarian as soon as possible. IF that is not possible tonight, then I can make some recommendations for you to try at home but in most cases with these signs all gets better within 2-3 days and if it does not then it is time for help. My top worry with my recommendations is that he is vomiting which means no medication may stay down long enough to exert an effect. This is why he really should be seen.
If he was my patient and you could not have him seen now I might recommend you try:
1) Continue to tempt him with a bland diet: Try white rice and boiled chicken
breasts (chopped) in about 3 meals per day. You may substitute cottage cheese for the chicken or boiled ground beef. You can use low sodium chicken broth (NOT stock) to flavor the food as well and get more fluids into him.
2) Give famotidine
20mg at 1 tablet every 12 hours for nausea/vomit. You should be able to find this medication at any pharmacy over-the-counter. It has no bad side effects and does a great job to settle stomach
acid and reduce nausea.
3) Encourage him to drink; perhaps even try an electrolyte solution such as Pedialyte for kids (non flavored).
4) Probiotic supplementation: Start a probiotic such as one made for dogs (Proviable or Fortiflora) or you may use culturelle as made for people (1 capsule daily). Or if you cannot get any of those products then give 1 tsp of plain yogurt once daily.
Indications this is an emergency: pain in his abdomen/stomach, bloody vomit/diarrhea, difficulty breathing, temperature of 104F or higher, profound lethargy/weakness or seizures
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