Symptoms of myocarditis in dogs:

1. Acute myocarditis often begins with symptoms of myocardial excitement, manifesting as rapid and substantial pulse, hyperpalpitations, and enhanced heart sounds.

2. After the sick dog exercises for a while, the heart rate increases rapidly, and it can continue for a long time even if the exercise stops.

3. When the dog’s myocardium suffers from malnutrition and degeneration, the main symptoms are heart failure.

4. When the heart's compensatory adaptability is lost, the sick dog's mucous membrane will become cyanotic, it will be highly difficult to breathe, the veins on the body surface will be dilated, and the extremities of the limbs and the chest and abdomen will be edematous.

5. Chronic myocarditis manifests as weakness, dyspnea, tachycardia, weak heartbeat, irregular rhythm, often accompanied by systolic murmur.

6. Dogs with severe myocarditis lose their appetite, become depressed, become comatose, and eventually die suddenly due to heart failure.

The causes of myocarditis in dogs:

1. Different degrees of myocarditis can usually be caused in the acute phase of infection by viruses or other pathogens, such as canine distemper, Canine parvovirus, leptospira, infectious hepatitis, influenza.

2. Certain parasitic diseases (such as Toxoplasma gondii, canine nausea filariasis) can also cause myocarditis.

3. Toxic diseases (such as carbon monoxide, heavy metals, phenols, organophosphorus, anesthetic drugs, etc.) can directly damage the myocardium, leading to myocarditis or myocardial degeneration.

4. In addition, sepsis, sepsis, allergies, rheumatism, anemia, etc. can all cause myocarditis.