My dog is lethargic, in pain, not sleeping, and acting scared. Why?

The stance in the picture and standing still likely means Spike's belly is still uncomfortable. I would recommend that he get checked out by a vet. Since he is an old guy, CBC, blood chemistry, urinalysis, with or without x-rays would be recommended to be able to determine if there is an underlying medical issue or if this is just simple nausea.

Synis experiencing very general symptoms of disease, these symptoms could fit almost any internal condition, maybe he is suffering from nausea due to a gastrointestinal disease and maybe he is in pain, from the symptoms described it's very hard to know. i would recommend taking him to the vet as soon as possible in order to get him checked, if he doesn't show any other obvious symptoms during the examination, a blood test and possibly an ultrasound will be needed in order to try and find out what is wrong with Syn.

Toby is experiencing very general symptoms of disease, these symptoms could fit almost any internal condition, maybe he is suffering from nausea due to a gastrointestinal disease and maybe he is in pain, from the symptoms described it's very hard to know. i would recommend taking him to the vet as soon as possible in order to get him checked, if he doesn't show any other obvious symptoms during the examination, a blood test and possibly an ultrasound will be needed in order to try and find out what is wrong with Toby.

If this is unusual behavior for your dog I would be concerned that there's something wrong. Shaking and lethargy can be indicative of pain, anxiety or that the pet just isn't feeling well. I would recommend that you take her to be seen by your regular veterinarian. A thorough examination will help determine what may be wrong and how to make her feel better

pheonix is experiencing very general symptoms of disease, these symptoms could fit almost any internal condition, maybe he is suffering from nausea due to a gastrointestinal disease and maybe he is in pain, from the symptoms described it's very hard to know. i would recommend taking him to the vet as soon as possible in order to get him checked, if he doesn't show any other obvious symptoms during the examination, a blood test and possibly an ultrasound will be needed in order to try and find out what is wrong with pheonix .

Poor Niko! I am not sure if he is still having problems but it sounds like he could be experiencing some pain. He could have back/neck pain or possibly dental disease and pain while eating. Have your vet examine him to determine the cause and treat. He may need an anti-inflammatory and pain medications to help. Hope he is feeling better soon!

Poor Pocholo! It definitely sounds like he isn't feeling well for some reason. Unfortunately, these symptoms are very vague and could be caused by almost any type of illness or injury, so there's no way to say what might be wrong without being able to examine him. I would recommend taking him to the vet for a check-up as soon as you are able to - he/she can do some blood work or other testing if needed to help determine what's wrong and get him started on appropriate treatment for the problem.