I had one running into stonewalls.. It was jumping six foot plus fences after cats..
It would do a whole street of back gardens.. Once got away, I could hear crash, bang & wallop. People screaming, more crashing. The dog had knocked over someone's BBQ & shamed a green house panel..
It was well behaved until it got into to full flight, then it was unstoppable..
It was a lunatic..
Its injuries were due to it having no self preservation it had some serious pray drive.. Was swimming proper rivers to get to a swan on the other side..
The dog was nothing but stress