Whenever I have an owner present to me with a case similar to what you write.
- Older cat
- Losing weight
- Vague signs of lethargy, etc.
...I discuss that there are a certain group of disease processes which tend to be more likely.
Possibilities include, but are not limited to:
- Hyperthyroid (overactive thyroid)
- Liver Disease
- Inflammatory Bowel Disease
(other causes such as dietary indiscretion and infectious causes such as parasites are also possible, but the above list is more likely)
In cases such as this it is recommended to have a veterinary examination and perform several tests to make sure there is not an underlying cause that requires specific treatment. These tests may include:
- Bloodwork to check the organ values (kidney, liver, electrolytes, blood glucose, and thyroid level.)
- Examination of the stool for bacteria, parasites, etc
- Maybe even x-rays
If the above tests do not find a cause -and you are still wanting to look - the next tests would then be an abdominal ultrasound.
Based on the examination and the tests above - either specific treatment or supportive treatment recommendations can be made.
While your signs do not seem serious enough to warrant an ER visit, this is something that I would recommend you visit your vet for...
I hope this information helps! Please let me know if you have other questions!_____________________________________________________________________
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The above is given for information only. Although I am a licensed veterinarian, I cannot legally prescribe medicines or diagnose your pet's condition without performing a physical exam. If you have concerns about your pet I would highly advise contacting your regular veterinarian.