Hi,
I´d say the most important is that the electric shock doesn´t harm humans, children, elder people. But for sure it should not harm the animals, too.
But they should recieve a clearly noticable electical shock.
3kV is not the problem as long as the energy is limited.
It just generates a short pulse. It may not last for 1s.....and 0.1mA is not noticable.
Frequency: I assume there are regulations. But there must be at least enough time to react on the pulse and move away from the wire.
I´d start with one pulse per second --> 1Hz
You may limit the current....but besides this I think there is no additional feedback necessary.
Klaus