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As billfields says, DOGS. There are loose dogs everywhere, and many of them are adept diggers. 8-12" will not necessarily be enough.
Foxes are also more common in many suburban and semi-urban areas than you might think, and especially when the babies are young, they will most definitely hunt during daytime. Dogs are much much more of a threat though.
I really do not think it's worth going to all the work of digging 18+" down (which is really what it takes to be reasonably secure) when you could do a 2-4' wide *apron*, horizontally on the ground surface or just below it, and get the same results.
Good luck, have fun,
Pat
As billfields says, DOGS. There are loose dogs everywhere, and many of them are adept diggers. 8-12" will not necessarily be enough.
Foxes are also more common in many suburban and semi-urban areas than you might think, and especially when the babies are young, they will most definitely hunt during daytime. Dogs are much much more of a threat though.
I really do not think it's worth going to all the work of digging 18+" down (which is really what it takes to be reasonably secure) when you could do a 2-4' wide *apron*, horizontally on the ground surface or just below it, and get the same results.
Good luck, have fun,
Pat