The dog that is missing due to this scenario most likely felt poorly, was confused, in pain or was experiencing all of these symptoms. . The dog has wandered away and could be in hiding and unable or unwilling to respond. Contrary to popular belief, I do not believe dogs go off to die. I believe they hide in an attempt to get away from anything that will disturb them due to their poor state of mind and health at the time. Unfortunately, when a dog goes into hiding or wanders away due to chronic or acute illness, like this, he most likely needs medical attention.
This scenario is not to be confused with a dog that has become injured or sick as a result of escaping or roaming. This animal is already experiencing these afflictions prior to going missing whether the pet owner is aware of it or not.