"Muscle spasms" are possible in pets but are usually better described as a strained or sprained muscle. This often follows vigorus exercise abou 12 hours later, or sometimes can occur by twisting or turning 'the wrong way.' The panting and rapid breathing may be associated with pain, and may indicate that the pain is severe. Sometimes there can be problems with the disks in the neck - this is an emergency. If your pet has difficulty walking or cannot seem to feel where his feet are, take him to an emergency veterniarian immediately for pain medications, x-rays, and possible injections.
We all know how bad back and neck pain can hurt, so having your regular Veterinarian administer pain medications and muscle relaxers is advised....ESPECIALLY if it gets worse. Rest is also advised. The less your pet moves, the better and faster they will heal. Please do not give over the counter pain medications such as aspirin or tylenol - these can be toxic and will severely limit the medications which a veterinarian may need to use on a future visit to help your pet.
Most starting medications are Rimadyl, Tramadol, and Methocarbamol.
Please let me know if I can help further.
Dr. Gordon
Dog Veterinarian
Chief of Staff, Senior ER Clinician