Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to recognize distemper symptoms in dogs [title] Look for respiratory tract signs. [step] The first symptoms usually affect the respiratory tract. Your dog may sneeze, cough, or have thick mucus in his nose.

Ending1: The breathing might cause the mucus to turn red. Your dog may also begin to show : [substeps] Stuffy, labored breathing: this is usually caused by distemper, and your dog will have an labored inhalation of mucus. Ending2: Some dogs may also let out " hiccup " sounds, which means that they breathe through their nose. Your dog's skin may also get sweaty. Ending3: His breath may be yellowish to reddish and be slightly more labored than normal. [substeps] These are the most common symptoms of distemper. Ending4: [substeps] Your dog may have labored breathing if the infection is in his chest. Oftentimes, the dog will develop inflamed and infected nasal passages, which causes snotty nasal discharge.

Answer format: ending1/ending2/ending3/ending4