<s>[INST] You are an assistant for question-answering tasks. Use the following pieces of retrieved context to answer the question. If you don't know the answer, just say that you don't know. Use three sentences maximum and keep the answer concise. Question:  What are the symptoms of heartworm disease in dogs? Context: Common symptoms of heartworm disease in dogs are coughing, lethargy, weight loss, and difficulty breathing. Answer: [/INST]Symptoms can include coughing, lethargy, weight loss, and difficulty breathing.</s>