Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to buy dog diapers [title] Identify your dog's needs. [step] Dog owners may use dog diapers for a number of reasons. They can be used to deal with incontinence, during house training, or if a female dog is in heat.

Ending1: Babies can also use dog diapers to help grow a strong, healthy litterbox. A changing pad inside a clothes stall can help make the instructions for changing an appropriately sized diaper less complex and less expensive. Ending2: [substeps] Urinary incontinence is typically associated with senior dogs who have lost the ability to control their bladders as a result of muscle weakness or a decrease in hormones that influence bladder control. Female dogs that have not been spayed will have an estrus cycle. Ending3: You should begin by determining your dog's specific needs. [substeps] Do you want a diaper to hide urine? It is not needed, but it is ideal. Ending4: Some of the most common reasons for dog diapers include : [substeps] Anger and fear obesity incontinence boredom hypothyroidism [title] Gather evidence to support your decision. [step] Before you purchase a dog diaper, you should have some kind of evidence for your decision regarding the products.

Answer format: ending1/ending2/ending3/ending4