Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to diagnose breathing problems in french bulldogs [title] Listen to your french bulldog breathe. [step] Under normal conditions (in cool weather and when your dog is not under stress), you'll probably hear some noisy breathing that doesn't bother him. But, if you close your eyes and hear noisy breathing that sounds like honking or rasping, your french bulldog may have a breathing problem.

Ending1: If you hear the dog emit occasional coughs or sighs, it may be caused by a respiratory problem. [substeps] Direct your dog's attention to your french bulldog's breathing. Ending2: Your french bulldog is probably breathing through their mouth. If you keep the tv turned on and listen to a race car drive by, then it may be breathing through its mouth. Ending3: [substeps] Breathing noise is caused by the compressed anatomy of the french bulldog's airways. The noisier the breathing, the worse the condition. Ending4: [substeps] Some dogs have a problem breathing when they're sleeping; double check with your vet if this is the case. [title] Look at your dog's ears.

Answer format: ending1/ending2/ending3/ending4