Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to fatten up a horse [title] Check your horse for health issues. [step] Before you begin fattening up your horse, make sure there are no other health problems that could be causing weight loss. You'll need to take your horse to the veterinarian to ensure your horse is healthy.

Ending1: Also be sure to keep your horse in a stable where you can show them the same health care practices for all manner of animals. [substeps] As a general rule, if your horse is exceptionally old, you'll need to start with a foal for your horse to start. Ending2: If your horse has a medical condition, the veterinarian will be able to prescribe the correct treatment, which will most likely help your horse regain any lost weight. [substeps] The two major causes of weight loss in horses are internal parasites (worms) and poor dental conditions. Ending3: These issues include : [substeps] Pediatrician medical records [title] Feed your horse. [step] As with food, make sure your horse's feeding and digestive system is strong enough to handle running. Ending4: [substeps] Your horse needs to be properly fed, weighed, and acquainted with its part in its grooming process. Make sure to include any previous horsewear you've purchased, as well as other items which might cause weight loss.

Answer format: ending1/ending2/ending3/ending4