On Thu, 17 Jul 2003 21:41:09 -0700 in rec.bicycles.misc, Zoot
Katz wrote:

Ammonia is used at dog shows for breaking up fights. Towels are soaked
in concentrated ammonia and thrown over the dogs heads.

Household ammonia in plastic containers has been used as a bear
repellent in Alaskan dumpsters for quite a while. Bear bites the
container, gets a snort of ammonia, drops it, and *never* returns
to that garbage source (and perhaps all human garbage).