I have a very large backyard and we try to keep it mowed, but there are still various weeds all over the place. Just after mowing, Sammie started to pick what was left of the weeds and eat them and now that's all he wants to do even though I try to not let him eat it, but now he just eats it when I'm not looking. Now Lucy is eating it too, and today she comes up to me staggering for a few seconds. She was fine after, but is this from the weeds? And does anyone know what weeds are potentially poisonous in Central Cali?