could have been though to be honest i was in the woods so possibly anything could have done it, its surrounded by barbed wire and if the thing he was after was true to form it would have been in and out the bramble along the fence line.
put some carpet around the mesh at the height hes hitting his tail at, is the kennel run large enough to stop him from doing it carboard centre from a tiolet roll tapped on with end left open to allow air in works
looks to me like your already doing all the right things youve created a bond thats half the battle won with a dog with that type of background, as millet says youve got all summer, instill the basics and start off easy in the autum,
best option all round puts the ball back in there court, although it could have been sent to them as a section 2 from the distributor or just a plain and simple balls up there end
one mate only, and he had them for 6 months for me in the past when i needed help, i also take care of his spaniels when hes away. he just helps himself and leaves me a note if im not in