Flexion is the most extensive of all the movements of the vertebral column, and is freest in the lumbar region. In extension, or movement backward, an exactly opposite disposition of the parts takes place. This movement is limited by the anterior longitudinal ligament, and by the approximation of the spinous processes.
Iodine Allergy in Dogs. As crabs contain small amounts of iodine, and some dogs are allergic to iodine, observer your dog carefully when first giving her crab meat. If your dog shows symptoms such as watery eyes and nose, stomach upset or lethargy, your dog might be allergic to iodine, and itâs not a good idea to continue giving your dog crab meat.
1 Also, it brings into question: What are these imitation crab meat sticks made of anyway? Itâs white fish paste of the surimi shaped like crabs meat, by the way (so seafood allergies can come about when eating them).  Real crab meat is okay for a dog to eat from time to time. The problem with feeding your dog surimi masquerading as crab meat sticks is that itâs filled with additives and food colorings, which can cause an allergic reaction for your dog (whether heâs a mutt or purebred).