Episodes may include one or any combination of the following:
* Freezing momentarily
* Freezing or walking with the head down and to one side.
* Stiffness in the back legs
* An apparent lack of coordination in the rear or front limbs
* A bunny-hopping gait
* Roached back with stiff back legs (may be a sign of back injury)
* Temporary loss of control in the hind legs
* Attempting to rise only to fall
* Rolling or somersaulting
* Laying on one side with the back legs extended, limbs may twitch
* Apparent 'spasm'
* Retraction of the front legs, sometimes over the head
* Tightening of the muscles around the mouth with an inability to open the jaws
* Eyes may appear to bulge as the muscles of the face contract.
* The 'deer stalker' position where the front legs contract and the rear legs stiffen (see the video of Penny)
* Chronic tenderness and stiffness may exsist in extreme cases.
After episodes, dogs with mild symptoms usually continue as if nothing has happened. If the episode is severe or lengthy, some panting may occur and the dog may rest. After severe episodes some puppies become frightened and take some time to calm down. Most get used to the events with age.