Hello, my name is***** and I have over 20 years of experience as a veterinarian. I'm sorry to hear that your fellow Sammy isn't feeling well and is eating poorly and experiencing hard, dry, small stools as well as drinking more than usual.
Certainly if he isn't eating much then stools should be small. As he eats less his intestinal tract slows down, giving more time for fluids to be reabsorbed from ingesta and contributing to dry, hard stools. However I suspect that there is an underlying disease process going on which is driving him to drink more and eat less which is also contributing to dry stools. His body is requiring more fluids to try and work as well as possible.
His lethargy and weakness could be simply due to eating less and having less energy available, but truly I think a big part is related to some sort of disease process that is increasing blood levels of waste products.
A lack of appetite could caused by a full or partial gastrointestinal obstruction, chronic pancreatitis, a dietary allergy or sensitivity, toxin exposure, a viral or bacterial infection, inflammatory bowel disease, disease, hyperthyroidism
(a tumor of the thyroid gland) and subsequent organ disease, internal organ failure (kidney
or liver disease or diabetes
), or even cancers such as lymphoma.
Because he hasn't eaten normally in several I am very concerned about him. As his liver breaks down fats for energy to live his liver may become overwhelmed and he may develop a type of liver disease called hepatic lipidosis, which can be life threatening.
Ideally he would see a veterinarian today sine this has been going on for more than 72 hours. Simple stomach upset should pass within 24 to 48 hours. They could examine him, run blood tests and a urinalysis, possibly check radiographs and/or an ultrasound to evaluate him and know best how to treat him.
In the meantime they can administer injectable anti-nausea drugs and fluids to rehydrate him.
If you cannot have him examined today for whatever reason there are some things you can try at home.
At home to try and settle his stomach and improve his appetite you can give either:
1) Pepcid ac (famotidine) at ¼ of a 10mg tablet per 5 to 10 pounds of body weight every 12 hours
2) Prilosec (omeprazole) at ¼ of a 10mg tablet per 5 to 10 pounds of body weight every 24 hours
These are acid reducers and may help him feel less nauseous so that he will eat and hopefully not vomit. They are quite safe and can be used long term if necessary.
You can use a medicine syringe to try and force water or low salt chicken broth into him orally.
A couple of hours after giving the acid reducer I recommend offering meat baby foods
or a bland diet of 2/3 boiled minced white skinless chicken and 1/3 boiled white rice mixed with some low salt chicken broth to make it easy to lap up and swallow.
If he continues to not eat he should see his veterinarian for an examination, diagnostics and intravenous fluids and supportive care.
Please let me know if you have any further questions.