The phrase "sick dogs" is an idiomatic expression that means unwell or sick animals. It can refer to any type of dog, whether it's a pet or a stray, that appears to be in poor health or showing symptoms of illness such as lethargy, loss of appetite, coughing, sneezing, vomiting, diarrhea, or other signs of discomfort. The phrase is often used by veterinarians and animal caretakers to describe dogs that need medical attention or treatment for their condition.