Damn. So we have a stair gate (to stop previous puppys from getting upstaris)... but we'd lost the screw bits that actually secure the thing. Anyway - found replacements on the internet, only £8 - bargain. Got them today... fitted the stair gate... took the monster approx 2 mins to work out there was a slightly larger gap at one side & squeezed through.... either that or she is truely a beast of the underworld and she simply went through the bloody thing!