lethargy

Pneumonia

Symptoms: First signs usually include lethargy, inapettence and fever. A deep cough is also present with progressive dyspnea, “blowing” of the lips (noted especially during exercise). Complications (Pleuritis, Mediastinitis) are also possible

Diaphragmatic hernia

Symptoms: dyspnea (the degree may vary from weak to severe pending on the amount of herniated viscera), later body weight loss, discomfort and lethargy

Vaginitis

Symptoms: excessive urination (micturition), vulvar discharge, sometimes fever and lethargy or discomfort 

Pyometra

Symptoms: usually begin 4 to 10 weeks after the estrus. Signs are variable: lethargy, polyuria (excessive urination), polydipsia (excessive drinking), vomiting, usually without fever, sometimes purulent vaginal discharge. Relative hard to diagnose without X-ray examination or diagnostic laparoscopy (surgical).