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I am sorry to hear you are worried about your Chihuahua. His tight abdomen could be from an enlarged internal organ, such as his liver. It could also be fluid in his abdomen which can be from a heart condition, or low blood protein. Another possibility is a tumor, since he is older.
I would have him examined and possibly have an Xray taken to find out why he has this swelling.
If you check his gums, are they pink in color, or pale?
Let me know how he is doing and if you have any other questions for me.
Can I help with or answer anything else? Was this helpful?
Some of these conditions can be treated. You need to find out what is wrong, to know how to treat it. I would start with a thorough physical exam by your veterinarian.
How is your Chihuahua doing?
I am so sorry to hear about Boo. My sincere condolences.
Draining the fluid does buy a little time, sometimes a week, sometimes only a day and then you have to drain it again.
If he recovered from heartworm and has been heartworm negative for 4 years, it may not have been the reason for his heart problems, but since he is a small dog the worms might have left enough damage in his heart and lungs that it did contribute. It is not uncommon for older Chihuahuas to develop heart disease, without ever having had heartworms.
My sincere condolences. Thank you for letting me know.
Thank you for the good rating. I am so sorry about Boo.