Hows this, its a herb that dogs hate :D
AME: Dog Bane (Plectranthus ornatus)
DESCRIPTION: Dog Bane is a lax perennial to around 40 cm tall with succulent stems and rounded, finely toothed leaves covered with fine hairs. Flowers are blue-mauve and encased in attractive white to bluish bracts. Click to see a picture.
The plant has a strong odour that many dogs find particularly unpleasant and they will avoid the plant.
ORIGIN: East Africa
CULTIVATION: Dog Bane grows easily in a sunny, well-drained position in a frost-free location. It is tolerant of dry conditions. Plants can easily be propagated from cuttings. Dog Bane is marketed in Australia under the name Dog Gone. Trim back after flowering to maintain a bushy habit.
USES: Dog Bane is used as a repellent, especially against dogs, but it can also be made into a spray and used as a general repellent and as a masking agent.