Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to check whether your horse or donkey needs to see a dentist [title] Understand the impact of an equine's age on their teeth. [substeps] Equines have baby teeth and between the ages of two and a half to four and half years, horses will cut 24 teeth. An equine dentist should be asked to check that all of the teeth have been shed correctly and to check that the new ones are in good condition.

Ending1: Older equines need equine dental care too. For a horse, teeth reach their life's end at around the age of 20. Ending2: [title] Encourage your horse to chew their teeth sparingly. [substeps] On particularly young horses, use daily dental care and work with your horse to spot signs of growth. Ending3: [title] Think about why your horse is in good condition. [step] There are many reasons a small animal might need to have a dental check. Ending4: [title] Observe the speeds at which the horse moves. [step] Do they move at a trot, canter, stop, or climb? [title] Monitor your horse.

Answer format: ending1/ending2/ending3/ending4