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Health A-Z

Common Pet Conditions

Start with a symptom, then learn what to monitor and what your vet may check.

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Clear symptoms
loss of appetite (3) vomiting (3) diarrhea (2) lethargy (2) Signs may vary (2) weight loss (2) a pot-bellied appearance (1) abdominal pain (1) and a dull coat (1) and bloody (1) and diabetic ketoacidosis (1) and jaundice (yellowing of gums/eyes) due to liver damage. “Blue eye” (cloudy cornea) can appear during recovery due to immune complexes. Severe infections can cause bleeding (petechiae or bruising) and swelling of the neck/head (1) and lethargy. Advanced cases may present with vomiting (1) and loss of appetite. Severe cases (often in puppies) present with high fever (1) and may be rapidly fatal due to liver failure or bleeding (1) and occasional shaking. In an acute crisis (1) and rapid dehydration. In kittens (1) and sometimes weight loss. Some cats may display abdominal pain or a hunched posture (1) and weakness (1) death may occur within 48–72 hours after onset of clinical signs (1) dehydration (1) depression (1) dogs can collapse with shock (1) Dogs may experience lethargy (1) evaluate for acute vomiting-related red flags and progression (1) evaluate for chronic vomiting-related red flags and progression (1) foul-smelling (1) foul-smelling diarrhea that can quickly lead to life-threatening dehydration. Affected pups often develop abdominal pain and bloating. The virus’s attack on bone marrow leads to low white blood cell counts (1) General symptoms include lethargy (1) increased appetite with weight loss (1) increased thirst and urination (1) increased urination (1) increasing risk of sepsis (1) intermittent vomiting (1) it can be rapidly fatal (1) Many adult dogs show no signs or only soft stools. Symptomatic cases (more common in puppies or stressed dogs) typically have diarrhea that can be acute (1) Many cats with a light parasite load show no symptoms. When symptomatic (1) Mild cases may show fever (1) Nonspecific signs such as lethargy (1) often with a greenish tinge or mucus. The diarrhea may be intermittent or continuous and can contain blood in severe infections. Affected dogs might have weight loss and poor coat condition due to malnutrition. Vomiting occurs in some cases. The dog usually remains alert and eating (1) poor growth (in kittens) (1) severe vomiting (1) severe vomiting and diarrhea (1) severe vomiting/diarrhea (1) signs include diarrhea (sometimes with mucus or blood) (1) Signs include excessive thirst (1) Signs include high fever (1) so fever and septic shock can occur in advanced cases. Without prompt treatment (1)
See all symptoms (50)
a pot-bellied appearance (1) abdominal pain (1) and a dull coat (1) and bloody (1) and diabetic ketoacidosis (1) and jaundice (yellowing of gums/eyes) due to liver damage. “Blue eye” (cloudy cornea) can appear during recovery due to immune complexes. Severe infections can cause bleeding (petechiae or bruising) and swelling of the neck/head (1) and lethargy. Advanced cases may present with vomiting (1) and loss of appetite. Severe cases (often in puppies) present with high fever (1) and may be rapidly fatal due to liver failure or bleeding (1) and occasional shaking. In an acute crisis (1) and rapid dehydration. In kittens (1) and sometimes weight loss. Some cats may display abdominal pain or a hunched posture (1) and weakness (1) death may occur within 48–72 hours after onset of clinical signs (1) dehydration (1) depression (1) diarrhea (2) dogs can collapse with shock (1) Dogs may experience lethargy (1) evaluate for acute vomiting-related red flags and progression (1) evaluate for chronic vomiting-related red flags and progression (1) foul-smelling (1) foul-smelling diarrhea that can quickly lead to life-threatening dehydration. Affected pups often develop abdominal pain and bloating. The virus’s attack on bone marrow leads to low white blood cell counts (1) General symptoms include lethargy (1) increased appetite with weight loss (1) increased thirst and urination (1) increased urination (1) increasing risk of sepsis (1) intermittent vomiting (1) it can be rapidly fatal (1) lethargy (2) loss of appetite (3) Many adult dogs show no signs or only soft stools. Symptomatic cases (more common in puppies or stressed dogs) typically have diarrhea that can be acute (1) Many cats with a light parasite load show no symptoms. When symptomatic (1) Mild cases may show fever (1) Nonspecific signs such as lethargy (1) often with a greenish tinge or mucus. The diarrhea may be intermittent or continuous and can contain blood in severe infections. Affected dogs might have weight loss and poor coat condition due to malnutrition. Vomiting occurs in some cases. The dog usually remains alert and eating (1) poor growth (in kittens) (1) severe vomiting (1) severe vomiting and diarrhea (1) severe vomiting/diarrhea (1) signs include diarrhea (sometimes with mucus or blood) (1) Signs include excessive thirst (1) Signs include high fever (1) Signs may vary (2) so fever and septic shock can occur in advanced cases. Without prompt treatment (1) soft or watery (1) though in heavy infestations appetite might decrease (1) vomiting (3) weight loss (2)
Symptom matches are best-effort. If a symptom is severe or sudden, contact a veterinarian promptly.

Endocrine and Metabolic

1 items

Gastrointestinal and Hepatobiliary

3 items

Infectious and Parasitic

1 items

Legacy / Unmapped

5 items
For pet owners
Use this page to learn what a symptom can mean, what to track at home, and when to get help. Bring notes to your appointment (timeline, appetite, water intake, urination, stool, vomiting episodes, medications and supplements).
For veterinary perspective
Each condition page summarizes common presentations, typical evaluation steps, and treatment approaches. It is not a substitute for diagnosis. Your veterinarian will consider breed, age, exam findings, and tests.