Mom has decided to use an organic potting soil, which usually has some form of manure included. How tasty is that! I don't believe that it's going to cause much harm. If the planting isn't quite done, adding some marigolds to the planter can help. There are also products that contain dog repellant that twist onto the plant, so when the dog approaches them, he gets a big whiff. If you use a spray type repellant, make sure to re apply after rain, or watering.