Here is a NON-toxic Weed Killer Recipe I found on the internet... It did work for me and alot safer with pets and children .
COST for 1/2 gal around $6.50
*1/2 tsp Dawn liquid dish soap (Dawn dish detergent strips the weed of its protective oils)
*1/2 gallon of Apple Cider Vinegar
*1/4 c table salt
Mix all those ingredients in a spray bottle and spray weeds thoroughly. taa daaaa
LET ME KNOW IF IT WORKED FOR YOU