My little bro lives in rented accomodation and the garden was horrendous. He cut it all down from waist height, but didn't dig the roots out. It is mainly brambles& sticky weed. Obviously he wouldn't listen to his big sister who told him to dig the roots out hehe. He then put a load of gravel down. Anyway obviously it is growing back and he was asking about using glyphosphate on the new growth. He has a dog. Would it be safe if he sprayed the ground and then kept the dog out of the garden for 2 days?