My fiancee is worried our Pomeranian is being poisoned by wind blown Verdone and/or Iron Sulphate.

The garden is netted off to the dog and should be safe. Is this a likely problem as the dog is old? It hasn't been particularly windy but any help would be appreciated. I put both on with a watering can with little or no overspray. It was a dry and warm day when I put both on (different days) and only slightly wet the day after. Many thanks