Is This an Emergency?
Answer 5 questions. When in doubt, call your vet.
1. Trouble breathing, blue/pale gums, or collapse?
2. Swollen, hard belly with retching but nothing comes up (dog)?
3. Seizure, or ate something poisonous?
4. Straining to pee with little or nothing coming out (especially male cats)?
5. Vomiting/diarrhea more than 24 hours, blood in it, or not eating for over a day (cats) / two days (dogs)?