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My dog was carbon monoxide poisoned: passed out, vomited everywhere, lost bowel and bladder control; later woke up, walks unsteadily, and still has seizures.
Suspected carbon monoxide poisoning needs immediate removal to fresh air and emergency vet care with 100% oxygen and fluids. Delayed treatment risks death or brain damage; recovery may leave neurological sequelae and needs restricted activity for six weeks.

Carbon Monoxide Poisoning in Dogs and Cats
Carbon monoxide poisoning occurs when pets breathe gas from faulty heaters, car exhaust, or confined smoke. It binds to blood and starves tissues of oxygen, causing vomiting, weakness, bright-red gums, seizures, and coma. Move the pet to fresh air and get veterinary help at once.
Why Is My Dog’s Tongue Turning Purple?
A healthy dog's tongue is light pink; a sudden purple (cyanotic) tongue means low blood oxygen from heart disease, lung disease, tracheal collapse, an airway obstruction, or toxins — and is an emergency. Watch for rapid breathing, low stamina, coughing, or lethargy. Also note pale (anemia) or bright red (heat/stress) tongues. Brachycephalic and toy breeds are highest risk; see a vet at once if the tongue goes purple.

Chorea (Involuntary Movement Disorder) in Dogs and Cats
Chorea is a neurological movement disorder in dogs and cats in which muscle groups twitch or jerk involuntarily, producing a dancing, uncoordinated gait. It usually stems from encephalitis linked to distemper, carbon-monoxide poisoning, tumors, or other brain disease, and treatment targets the underlying cause.

How Tobacco Smoke Affects and Harms Cats
Secondhand smoke is well known to harm humans; many hold back in public but think less about it at home with their cat.