So keep an eye out. Your neighbor probably doesn't own any farm animals, but look for ways to help care for your neighbor's stuff. Maybe he left his lights on--save him from a dead battery in the morning. Maybe it's raining and the UPS driver left a package out where it can get wet. Maybe you've found the neighbor's family dog that has gotten out. Helping your neighbor in a time of need may provide a great opportunity for you get to know him or her better; and it's a great way to show love as Christ instructed us to do.
*On a technical note, there's some discussion as to the word translated as 'brother' in the ESV version above. The Hebrew word can mean brother or kinsman or potentially even neighbor. Some argue that this level of care should be reserved for family; however, I would argue that the familial use of brother is not the best way to think about brother in this passage. Look at verse 2. Notice that there is a possibility that you might now know the owner of the ox or sheep. Therefore, you are told to care for the animal until the owner is determined. It would be challenging to reserve this kind of care to family if you don't even know who the owner of the animal is. I would think then, this passage is calling us to help all those around us, potentially everybody we come in contact with.
**Photo is registered under a creative commons license: http://www.flickr.com/photos/stignygaard/ / CC BY 2.0