You can only change your neighbor's fence with their permission. A neighbor's fence is their property, and altering it without their consent could constitute trespassing or property damage, which may have legal consequences. If you have concerns or disagreements about your neighbor's fence, communicate with them openly and try to reach a mutually agreeable solution. If you believe the fence violates local zoning laws or property regulations, consult with local authorities or seek legal advice to address the issue through proper channels. 

Determining the best type of fence to contain your pet can be tricky. Consult a pet fence installer and consider the following questions:

• What size pet do you have? Some fence types, like chain link, are too short to contain large dogs.

• Is digging an issue? Some fences, like brick or stone, help minimize digging at the fence line, where wood fences aren’t as adequate. 

• Do you need to block your pet’s view of the neighbor's yard? Some fences, like metal iron fencing and chain link, don’t offer an obstructed view.

A fence post set in concrete lasts anywhere from five to over 25 years, depending on how well the concrete was applied and the fence post’s material. Untreated wood posts in concrete could last less than 10 years, but a durable, treated wood set in properly applied concrete could last a few decades. However, all fence posts will wear out eventually, so expect to need to replace your fence post every five to 15 years.

Pickets should sit at least 2 inches off the ground to encourage groundwater to flow underneath. Pickets can sit as much as 6 inches off the ground, but setting it any higher could let pets in or out of your yard unintentionally. These are not to be confused with the fence posts anchored underground with soil or concrete footing.