Pet friendly weedkiller
The paving slabs in the patio were laid with almost one inch wide gaps between. The cement infill was recessed below the level of the slabs. Over the years has become covered by various types of organic detritus which has been colonised by weeds. Long term solution is to rake out and replace the cement but until I can get round to it I would like to kill the weeds. Having a dog what is a suitable weedkiller?