does a thiamine deficiency cause dilated pupils
What to Watch For. Common symptoms of Thiamine Deficiency in Dogs may include: 1  Ventroflexion (bending in a downward position) of the neck. 2  Muscle weakness. 3  Ataxia (wobbly walking). 4  Seizures. 5  Fixed, dilated pupils. 6  Paralysis of the muscles around the eye.