Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to diagnose canine periodontal disease [title] Smell your dog's breath. [step] Along with other symptoms, a dog who has periodontal disease may have bad breath because of the bacteria in his mouth. In some cases, bad breath may be the only noticeable symptom of periodontal disease.

Ending1: [substeps] If your dog is having bad breath, then he may be breathing infrequently due to the bacteria accumulating in his mouth. [title] Notice if your dog doesn't eat or drink a lot. Ending2: [substeps] Smell your dog's breath to see if it smells foul or fresh. If your dog has noticeable bad breath, then take him to your veterinarian for an oral exam. Ending3: If your dog has periodontal disease, clean and dry his teeth at least twice a day. [substeps] The sooner you expose your dog to fresh air, the sooner the disease will begin to infect him. Ending4: Of course, dog breath is just that; it is an infection of the mouth, and nothing more. Finally, back your dog's mouth shut, press down on the teeth, and smell the breath.

Answer format: ending1/ending2/ending3/ending4