Friend, there are several possible causes with the history you describe about Abby's symptoms. My first and main concern was the Abby was drinking more than usual. You see, when a dog drinks more than usual it is a sign of an underlying medical problem. Common causes are: Diabetes
, kidney or liver disease and even cancer to name a few causes. All of these diseases will cause the patient to drink more and loose weight. Diarrhea can be caused by all of these diseases as well. Then, we have the back leg problem which may be related to arthritis
. In addition, the weakness that is often seen with any of the above mentioned diseases.
Right now Abby has stopped drinking, that is another concern because it suggest that if she has any of the above mentioned diseases her system could be shutting down; this could be fatal if she is not seen by a veterinarian quickly. Unfortunately in this case we are very limited as to what you can do at home for Abby. She needs to be seen by a veterinarian today for supportive care (IV fluids, etc.). While vet is providing supportive care they will run some testing to determine which of the above is the underlying cause. Additional treatment will be determined by clinical and diagnostic findings. Highly recommend having her checked today by ER veterinarian.
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