[RFI] RFI to wireless dog fence??

[Alan NV8A]

Quite a while back our next-door neighbors were trying out a wireless 
dog fence but then dumped it because their dog was getting zapped even 
within the perimeter -- perhaps even inside the house.

It suddenly occurred to me to wonder whether my amateur radio 
transmissions could have been triggering the receiver. What frequencies 
do these thing use typically? I assume that they are Part 15 devices. 
Are some known to suffer from RFI?

Alan NV8A