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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
Signs may vary (4) diarrhea (3) vomiting (3) weight loss (3) lethargy (2) loss of appetite (2) a pot-bellied appearance (1) a transient fever and lymph node enlargement may occur but are often missed. Later (1) abdominal pain (1) and a dull coat (1) and anemia (1) and bloody (1) and general poor condition develop. Advanced cases can show persistent fever (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 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 weakness (1) chronic secondary infections (eg (1) death may occur within 48–72 hours after onset of clinical signs (1) depression (1) dogs can collapse with shock (1) Dogs may experience lethargy (1) evaluate for acute diarrhea-related red flags and progression (1) evaluate for chronic diarrhea-related red flags and progression (1) evaluate for hemorrhagic gastroenteritis/acute hemorrhagic diarrhea syndrome-related red flags and progression (1) evaluate for small intestinal bacterial overgrowth / antibiotic-responsive diarrhea-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 thirst and urination (1) increasing risk of sepsis (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) neurologic issues (1) Often no signs early on. Within 1–3 months after infection (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) recurrent gum infections (1) respiratory or skin infections) (1) severe vomiting (1) severe vomiting and diarrhea (1) severe vomiting/diarrhea (1) signs include diarrhea (sometimes with mucus or blood) (1) Signs include high fever (1)
See all symptoms (51)
a pot-bellied appearance (1) a transient fever and lymph node enlargement may occur but are often missed. Later (1) abdominal pain (1) and a dull coat (1) and anemia (1) and bloody (1) and general poor condition develop. Advanced cases can show persistent fever (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 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 weakness (1) chronic secondary infections (eg (1) death may occur within 48–72 hours after onset of clinical signs (1) depression (1) diarrhea (3) dogs can collapse with shock (1) Dogs may experience lethargy (1) evaluate for acute diarrhea-related red flags and progression (1) evaluate for chronic diarrhea-related red flags and progression (1) evaluate for hemorrhagic gastroenteritis/acute hemorrhagic diarrhea syndrome-related red flags and progression (1) evaluate for small intestinal bacterial overgrowth / antibiotic-responsive diarrhea-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 thirst and urination (1) increasing risk of sepsis (1) it can be rapidly fatal (1) lethargy (2) loss of appetite (2) 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) neurologic issues (1) Often no signs early on. Within 1–3 months after infection (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) recurrent gum infections (1) respiratory or skin infections) (1) severe vomiting (1) severe vomiting and diarrhea (1) severe vomiting/diarrhea (1) signs include diarrhea (sometimes with mucus or blood) (1) Signs include high fever (1) Signs may vary (4) 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 (3)
Symptom matches are best-effort. If a symptom is severe or sudden, contact a veterinarian promptly.

Dermatology and Allergy

1 items

Gastrointestinal and Hepatobiliary

3 items

Infectious and Parasitic

1 items

Legacy / Unmapped

6 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.