Human: How do you know when your dog needs medical attention? Assistant: 
You should always take your pet to a veterinarian if they show any signs of illness or injury. Symptoms can include changes in behavior, such as depression, lethargy, loss of appetite, vomiting, and diarrhea; coughing, difficulty breathing, or other respiratory symptoms; lameness or limping; bleeding or discharge from the nose or eyes; swelling; lumps or bumps on their skin; and fever. It is important to consult your vet as soon as possible if your pet displays these symptoms.