Cindy is a Labrador and her age is 2 years and 3 months. She is pretty active. Yesterday morning she was playing with my husband and when she sat down she couldn't move her hind legs it was like paralyzed for 2 mins though she was in sense and tried to get up as hard she could but she couldn't move. Me and my husband was hell scared to see what happened, however after 2mind everything was normal. Even now she is again back to her naughty self. Please help to understand is there something we need to care about.