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Hi. My name is***** Thank you for your question. This is an interesting one that in all reality depends on the situation. Some dogs can go days without defecating if they aren't eating as well or if they are physically upset with their situation. If a dog is eating and drinking well and not having anything else going on that is stressing them, most typically are defecating at least once a day. Can I ask why you are asking this question?
I'm sorry to hear about his situation. Did he become paralyzed in his back legs due to a disc issue? Has he seen your vet for this? Is he still eating and drinking well? Is he urinating? This is actually more important. When a dog goes down in the rear due to a spinal cord issue, they can actually have an inability to urinate properly and can need to be expressed on a regular basis.
That is good that your vet has seen him and that he's urinating. As far as not defecating in a situation like this, it can be something that I wouldn't worry about it for 3 to 4 days. Again, if he's not eating as much, he won't have the material moving through to defecate as much. The spinal cord situation won't affect stool passage through the GI tract. He will defecate when he has the needed stool built up.