My family has a terrier that is about 14 years old.....as far as I know she was acting normally before I went to bed..... I slept all day today, and tonight I hear some random noises outside my bedroom door, flopping tapping, etc....several hours later when I could be bothered to investigate, I see the dog pacing around by the front door, hind legs collapsing...walking funny and almost nervously...when I approached her she acted startled over and over almost like a full body jerk, and she keeps doing that again and again every time you get near her. She also acts very sedated and won't react properly to anything. The most I could do was look in her pupils with a light, they seem to be equal and reactive, perhaps slightly more sluggish than human pupils I don't know if that's normal or not. I think it's highly unlikely that she could have gotten into any poison or drug around here, but then again who knows... What could possibly be wrong with her?