There are various reasons why your dog may be having abdominal muscle spasms, and the best way to tell for sure is to take it to the vet who will be able to give a proper considered opinion and will offer the correct course of treatment. That would be the best advice because you want your dog to be healthy - advice given on a forum like this tends to be largely general and not necessarily in the best interests of the animal. Having said that, I'll give some examples as to what the issue could be but you should definitely see the vet. Muscle spasms in dogs can be due to constipation and if the dog is constipated then try feeding it canned pumpkin which should help its digestive system. Other causes include ulcers, difficult urination, gastritis or stomach pain due to nausea. Check if the muscle spasms are accompanied by vomiting because this could be due to an intestinal
blockage. Sometimes back pain can cause abdominal spasms as well so if you think it may be suffering back trouble then try palpating its back by lightly pressing along the side of the spine and at the base of the back to see whether the dog reacts.
blockage. Sometimes back pain can cause abdominal spasms as well so if you think it may be suffering back trouble then try palpating its back by lightly pressing along the side of the spine and at the base of the back to see whether the dog reacts.