what i have used before which the horses totally hate and nips any fence
teething in the bud is rubbing the top surface with plain old Ivory Soap....do
it a couple times and they quit....only problem is having to reapply after a
rain, but I found it halted the problem.
A boarder horse here was starting to windsuck on the pipe
rails......the soap stopped that too.
Creosote was taken off the market, at least
in California, as being a carcinogen..... There is a product called chew
stop I think that you can still get. mb