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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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lethargy (4) fever (3) weight loss (3) and reduced appetite. In severe cases (2) diarrhea (2) loss of appetite (2) pneumonia may develop (2) Signs may vary (2) A persistent (1) a transient fever and lymph node enlargement may occur but are often missed. Later (1) abdominal pain (1) affected cats develop recurrent infections (eg (1) and anemia (1) and bloody (1) and general poor condition develop. Advanced cases can show persistent fever (1) and in severe cases (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 (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 may bring up a small amount of white foamy phlegm. Despite the harsh cough (1) and rapid dehydration. In kittens (1) and sometimes signs of anemia or cancer (lymphoma (1) as if trying to clear something (1) chronic secondary infections (eg (1) Common signs include fever (1) Common signs include sneezing (1) conjunctivitis (1) death may occur within 48–72 hours after onset of clinical signs (1) depression (1) Dogs typically develop a persistent cough (dry or productive) (1) dry “honking” cough is the hallmark symptom. Affected dogs often gag or retch (1) Early infections may be asymptomatic or cause mild fever and lymph node enlargement. Over time (1) evaluate for fever of unknown origin-related red flags and progression (1) evaluate for rocky mountain spotted fever-related red flags and progression (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) increasing risk of sepsis (1) it can be rapidly fatal (1) joint swelling (1) kidney inflammation (Lyme nephritis) (1) leukemia) (1) many dogs remain bright and active with a normal appetite and no fever. In some cases there may be sneezing or a mild runny nose (1) Mild cases may show fever (1) more severe cases can show lethargy (1) nasal and ocular discharge (1) nasal discharge (1) neurologic issues (1)
See all symptoms (64)
A persistent (1) a transient fever and lymph node enlargement may occur but are often missed. Later (1) abdominal pain (1) affected cats develop recurrent infections (eg (1) and anemia (1) and bloody (1) and general poor condition develop. Advanced cases can show persistent fever (1) and in severe cases (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 (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 may bring up a small amount of white foamy phlegm. Despite the harsh cough (1) and rapid dehydration. In kittens (1) and reduced appetite. In severe cases (2) and sometimes signs of anemia or cancer (lymphoma (1) as if trying to clear something (1) chronic secondary infections (eg (1) Common signs include fever (1) Common signs include sneezing (1) conjunctivitis (1) death may occur within 48–72 hours after onset of clinical signs (1) depression (1) diarrhea (2) Dogs typically develop a persistent cough (dry or productive) (1) dry “honking” cough is the hallmark symptom. Affected dogs often gag or retch (1) Early infections may be asymptomatic or cause mild fever and lymph node enlargement. Over time (1) evaluate for fever of unknown origin-related red flags and progression (1) evaluate for rocky mountain spotted fever-related red flags and progression (1) fever (3) 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) increasing risk of sepsis (1) it can be rapidly fatal (1) joint swelling (1) kidney inflammation (Lyme nephritis) (1) lethargy (4) leukemia) (1) loss of appetite (2) many dogs remain bright and active with a normal appetite and no fever. In some cases there may be sneezing or a mild runny nose (1) Mild cases may show fever (1) more severe cases can show lethargy (1) nasal and ocular discharge (1) nasal discharge (1) neurologic issues (1) Often no signs early on. Within 1–3 months after infection (1) or difficulty breathing if pneumonia develops (1) oral) (1) persistent fever (1) pneumonia may develop (2) poor coat condition (1) recurrent gum infections (1) respiratory (1) respiratory or skin infections) (1) severe vomiting (1) severe vomiting and diarrhea (1) shifting-leg lameness (1) Signs include high fever (1) Signs may vary (2) so fever and septic shock can occur in advanced cases. Without prompt treatment (1) Symptoms vary: wet FIP causes fluid accumulation in body cavities (1) vomiting (1) weight loss (3) while dry FIP leads to granulomas in organs (1)
Symptom matches are best-effort. If a symptom is severe or sudden, contact a veterinarian promptly.

General and Multi-System

1 items

Infectious and Parasitic

5 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.