I wonder if you put anise in dog food, if it would reduce the possibility of
heartworm from mosquito bites. Anise is in lots of biscotti recipes. Jess

The licorice-flavored herb anise contains high levels of health-boosting
compounds called phenylpropanoids.

A team of researchers isolated 22 compounds in anise essential oils, and
found some phenylpropanoid compounds that were unique to anise, and four of
the compounds had never before been identified in any plant.

Aside from effectively controlling aphids and the plant fungus
Colletotrichum, the compounds also showed promise for human health problems.
Specifically, some of the compounds were effective against:

  a.. Plasmodium falciparum, the parasite that causes malaria in humans.
  b.. Mycobacterium intracellulare, a bacterium that can cause illness in
people with compromised immune systems.
Further, some phenylpropanoids had anti-inflammatory and phytoestrogen
properties.

The researchers suggested that compounds in anise essential oils may be
useful for developing pharmaceuticals and agrochemicals.
Sources:
  a.. Science Daily March 12, 2008
  a.. Pure and Applied Chemistry 2007, Vol. 79, No. 4, pp. 539-556