I spent over $500.00 for my coop and yard. The coop design I borrowed from this site because it was off the ground and sturdy. The chichen wire for the perimiter fence is burried 12" in the ground to keep those diggers out. I have a neighbor with a small terrier that would kill my flock if he got half a chance. Reinforce the door. If the dog returns, he'll go for the place he was sucessful at last time. Hopefully the owner will be more observant of the K-9. Be carefull with a electric fence. A little one could touch it before you relize they are out of site. I got our chicks for a family project too and I'm sorry for your family's loss. Good luck with your new brood.