Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to choose tartar control dog treats [title] Provide your dog with chewable toys. [step] Giving your dog a durable chew toy can mechanically remove plaque buildup on your dog's teeth and massage your dog's gums. As the dog chews, the friction between the teeth and the toy can remove plaque and stimulate saliva production and will help whisk away any plaque buildup.

Ending1: [substeps] Don't give your dog chew toys in a confined area. As the tartar build up can get in the way, avoid giving your dog chewing toys. Ending2: [substeps] Buy shiny plastic toys that are made for dogs with a soft film of tartar on them. The plastic toys will help prevent plaque build-up and encourage your dog to chew. Ending3: [substeps] Chew toys that are basically rubber cookie-crusters are widely available. These are great because they can be quite expensive. Ending4: These toys will also help keep your dog entertained and will exercise the dog's jaw. Nylon or hard rubber chew toys are safe options and are recommended for their durability.

Answer format: ending1/ending2/ending3/ending4