Fever, or pyrexia, is an increased body temperature, surpassing 102.5 °F (39.2 °C) in cats.

Head pressing is a behavior demonstrated when a dog compulsively faces a wall or corner and remains there without moving or appearing engaged in any kind of activity for a period of time.

Pale gums are identified when the normal light pink color of the gum tissues turn pale or white, indicating a serious underlying condition.

Acid, or Gastric reflux (GR) is defined as the movement of gastric secretions from the stomach into the esophagus. 

Elapid envenomation occurs when a dog is bitten by a snake from the elapid family (e.g. coral snakes).

Venomous snakes are found in many locations throughout the world, however most reports of dog envenomation

Cats are particularly sensitive to many flea and tick medications, and exposure to formulations that are not specifically approved for feline use can be fatal.

Increased thirst, or polydipsia, is a common symptom of many conditions in dogs.

A seizure is an abrupt episode of uncontrollable muscle activity and is the physical manifestation of abnormal electrical discharges in the brain. 

Collapse is the inability to maintain a normal, standing posture, and is a rare symptom in cats. Cat owners may see their cat suddenly fall or intentionally lie down, then be unable to stand up.

Chocolate toxicosis refers to poisoning caused by ingestion of chocolate, and is rare in cats. As with any case of poisoning, severity depends on the type and quantity of chocolate consumed.

Difficulty breathing (dyspnea) is always cause for concern, so any dog who suddenly exhibits this symptom needs emergency medical care. Many conditions can cause dyspnea,

Paralysis is the complete loss of the ability to move or feel a part of the body. It can affect any or all limbs of the body, the face, or the vocal cords. It may be acute or chronic.

Paralysis is the lack of ability to voluntarily move one or more parts of the body. It may or may not be accompanied by loss of sensation.

Bromethalin is a neurotoxin that disrupts normal function of the brain and spinal cord, causing paralysis or convulsive activity when ingested by cats.

Mothball poisoning is caused by close contact (ingestion, inhalation, or dermal exposure) with mothballs. 

Onion toxicosis is poisoning caused by ingestion of any form of the plants belonging to the Allium genus: onion, garlic, leek, shallot, scallion, and chive.

Ethylene glycol (EG) is a highly toxic ingredient in antifreeze products that causes poisoning in dogs when ingested

Chocolate toxicosis results when dogs ingest dangerous amounts of chocolate. Methylxanthines like theobromine and caffeine are toxic to dogs,

Seizures result from abnormal electrical activity in the brain. Seizure activity varies from subtle staring to complete collapse and muscle spasms (convulsions).

In dogs, sufficiently high doses of the common sugar substitute xylitol are toxic because they trigger a rapid release of insulin that drops blood sugar levels dangerously low.

Anticoagulant poisons are commonly used for pest control of rodents. Cats occasionally consume toxic doses of these poisons and subsequently develop life-threatening internal bleeding.

When dogs eat garlic, onions, or other *Allium* species, red blood cell damage results. This is often called onion toxicosis, no matter what type of allium plant was consumed. **Onion toxicosis is potentially life-threatening**.

Mushroom poisoning occurs as the result of ingestion of a toxic dose of a poisonous mushroom.

Mothballs in any form (cubes, balls, flakes, cakes, scales, powder) contain pesticides, such as camphor, naphthalene or paradichlorobenzene, which are toxic to cats.

Xylitol toxicosis occurs in cats following ingestion of a toxic dose of this common artificial sweetener.

Yellow eyes, ears, or skin on a cat is called jaundice, or icterus. It is associated with liver damage and damage to red blood cells.

Dyspnea is when a cat has difficulty inhaling or exhaling and isn't getting enough oxygen.

Ataxia means “difficulty walking”. An ataxic cat has difficulty controlling the movements of the head, legs, or torso.

Yellow pigmentation of the eyes, gums, nostrils, and ears is called jaundice or icterus. Jaundice occurs when there is a buildup of bilirubin, a yellowish pigment released during red blood cell breakdown and normally excreted in bile