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Thank you for the prompt reply.
This is very worrisome and I would tell you that if he is still exhibiting signs of restlessness and discomfort as well as weakness, I would definitely seek veterinary intervention today. It is a good sign that he passed a normal stool yesterday, but I worry about internal bleeding or a GI obstruction. Intestinal parasites are high on the list of causes of GI distress in pups, but they would have to be severe to cause that much discomfort.
Intestinal intussusception (a condition where the intestine telescopes in on itself) can lead to many of the signs you describe and is very uncomfortable. If present, and not treated, it can be life threatening. If you have ER services available and he is not improving, I would seek those out today.
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That sounds like the safest plan. Please keep me updated as to how things progress.
Thank you for the update.
I am not sure what to make of the bleeding in the liver. When I hear of a puppy that is not thriving and is gaining weight as expected, I am suspicious of a possible hepatic (liver) shunt. Perhaps that may be what is going on and could be what he was seeing.
Here is a link with more information about liver shunts in dogs.