Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to recognize kennel cough in dogs [title] Listen to your dog's cough. [step] The first and most obvious symptom of this condition is a cough. This cough starts suddenly, often overnight, and is a harsh, barking, hacking cough.

Ending1: Many owners phone a vet clinic and describe their pet as having " something stuck in his throat " because of the harsh, hacking, retching sound the dog makes. [substeps] This is no quiet cough, but a whole body movement where the dog extends his neck to straighten his airway and coughs so forcefully that his whole body shudders. Ending2: [substeps] If your dog displays these symptoms, you should take your dog to the vet. The vet will likely be able to diagnose this condition on its own, but you can still get this disease. Ending3: [substeps] It is a good sign if your dog has kennel cough. Puppies born at the same time as adult dogs are more likely to have kennel cough. Ending4: This cough can cause severe body aches and it lasts for several days or longer. The cough can be a sign of some type of condition that can require treatment, and get worse as the dog ages.

Answer format: ending1/ending2/ending3/ending4