Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to keep your dog busy for hours [title] Bring your dog a friend. [step] Dogs love playing together. Together, your dogs will have hours of fun sniffing each other, chasing one another around the house, and cuddling together on the sofa.

Ending1: [substeps] Make sure your new pet gets along with your original one. Rescue shelters usually allow you to foster a pet before you adopt it permanently. Ending2: If you have all of your dogs at once, consider bringing your furry companion along with you for longer. In the event that you have either a puppy or an adult dog together, bring him/her along too. Ending3: Having a friend or another good companion along in the house will make the passion fully apparent. Plus, if you have siblings, you probably don't want your dog missing out on a friend's time. Ending4: Let your dog tag along and watch whatever games your dog will win. [substeps] Dogs are social creatures, and should make time for themselves while playing together.

Answer format: ending1/ending2/ending3/ending4