I have an Aussie and two pugs. They found it very entertaining to challenge the gates for the first couple of weeks! First they figured out that pulling the wire enough would make the handle slip until it opened. Then they would pull the wires until they broke loose from the poles. Also the top gate rail was a little short so not as study as it could be! There were a few more escape instances but they have settled down and gotten used to it now.
The ground in my yard was full of buried rocks, roots, and uneven so trial and error was used to adjust the wires of the fencing and some of the spikes had to be cemented in for support.