Molly is a 20 month old, 11 lb Shih Tzu who is normally a very active, happy little girl. Yesterday she vomitted 3 times within 3-4 minutes...almost looked like stool. This afternoon she projectile vomited watery brown. We were traveling home from our daughters and she got in my lap and slept. Her nose was very dry, she never even lifted her head or moved for 2 hours. She is now very lethargic and does not want to be held or touched. She normally has a very bright look to her eyes, they now are dull, droopy like she's sleepy. She got into the cats food yesterday and possibly the litter box. Should I take her to the emergency vet tonight?