Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to check for signs of dental disease in dogs [title] Monitor your dog's breath. [step] One of the most common signs of dental disease in dogs is bad breath or " doggy breath. " your dog should not have bad breath.

Ending1: Bad breath can mean an infection of the gums or teeth. Bacteria from tartar build up can also cause an odor. Ending2: However, having bad breath may indicate that your dog has dental disease. [substeps] Good breath indicates your dog has dental disease. Ending3: Begin by reading your dog's breath closely. Notice the difference in density, tone, and lack of aroma. Ending4: Some breath may also be absent, missing, or scaly, especially if you take your dog outside. [substeps] Look for bad breath while playing with your dog.

Answer format: ending1/ending2/ending3/ending4