I recently received an email from someone considering adopting a Podenco and asking if invisible fencing would be suitable. He already used it on his other dog. Rather than respond with just my own view - hate the product!! - I posted the question on my facebook podenco pages and Podenco Post. Not surprisingly the 100% response was resounding NO and in some countries like Scandinavia and the UK it is illegal.
Coincidentally an article on the subject arrived in my Inbox this morning. You can read the full article on this link.