What is an Emergency?
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If your cat has any of these symptoms, bring it in IMMEDIATELY 
Symptom: With:
Inability to Breathe Noisy respiration, blue tongue, gasping for breath.
Bleeding That Won't Stop From any part of the body. Apply pressure and come now!
Inability to Urinate or Appears Constipated But continues to try.
Inability to Deliver Kittens Keeps trying or has stopped trying
Pain Severe. Continuous with no relief.
Vomiting, Diarrhea Continuous or with the Appearance of Blood.
Loss of Balance or Consciousness Includes tremors, coma, staggering, blindness, fainting.
Itching Continuous scratching, biting, self-mutilation.
Penetrating Wounds Any place, but especially chest or abdomen.
Poisoning Bring the container or commercial name and chemical name.
Injury Continuous pain and/or total lameness.
Hit by car Even if seems to be OK.
Any other sign that looks serious!  
 
 
If your cat has any of these symptoms, bring it in TODAY
Symptom With
Difficult Breathing With or Without Cough. Eats and Drinks. Not Frantic.
Vomiting / Diarrhea Without Blood; No Pain; No Unusual Contents.
Sudden Lameness No apparent cause.
Swallowed Object Even if you THINK cat swallowed it.
Severe Itching With possible self-mutilation.
Strange Odor Usually disagreeable, from any part of the body.
Burns Heat, Chemicals. Go Immediately if Extensive.
Injuries Not severe emergency but will worsen with delay-lacerations.
 
 
If your cat has any of these symptoms, it is safe to wait OVERNIGHT
Symptom With
Vomiting / Diarrhea No blood, no foreign material, no pain, not continuous.
Itching Mild to moderate; no skin damage; not continuous, no bleeding.
Lameness Little or no pain; no discomfort in walking; not continuous.
Thirst / Urination Excessive drinking and/or elimination of urine with no blood, no pain, no straining or discomfort, or bloody appearance to the urine.
Loss of Appetite Skipped one main meal, but no other signs of illness.
Most Skin Problems