Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to tell if your dog is depressed [title] Think about whether your dog has become withdrawn. [step] Most healthy, happy dogs are highly sociable creatures. If your dog is not greeting you as excitedly when you come home-less of a tail wag, less energy and movement-or loses interest in activities they once enjoyed, they may be depressed.

Ending1: [substeps] Instead of running to the door to greet visitors, a depressed dog may slink away and find an out-of-the-way corner to curl up and go to sleep. Be particularly concerned if your dog hides from you. Ending2: Loss of your small dog's outgoing nature might have been the result of depression. If you'd like to identify your dog's symptoms, make a note of how much they have changed. Ending3: If your dog rarely displays mood changes or displays its usual energy, and is suddenly very quiet, or even struggles to concentrate, it could be depressed. [substeps] Understanding what your dog is experiencing may be the best thing you can do to help figure out what's wrong. Ending4: Depressed dogs may need some time to detox and recover. [substeps] For instance, if your dog suddenly start acting normal without energetic energy or acts withdrawn, this could indicate depression.

Answer format: ending1/ending2/ending3/ending4