My sister has a dog that sounds just like Delta.
We rescued 40+ Sibes staked out in the desert by a very, shall we say, "unbalanced" gentleman. Some of these dogs were completely feral, especially a litter of nine month old pups that had spent their entire lives staked on a six foot chain in the middle of the desert, with no human contact whatsoever except a 50 pound bag of dog food throw to them and a water barrel filled once every week or two. Literally.
My sister kept three of these puppies. It took about a year for two of them to come around to semi-normal dog status. The third one never will. Five years later, she is still pretty much feral. She will come in the house finally, after about three years ... but only when no one is home but my sister, and she remains absolutely motionless.
"We give dogs the time we can spare, the space we can spare and the love we can spare. And in return, dogs give us their all. It's the best deal man has ever made" - M. Facklam
"We are raised to honor all the wrong explorers and discoverers - thieves planting flags, murderers carrying crosses. Let us at last praise the colonizers of dreams."- P.S. Beagle
"All that is gold does not glitter, Not all those who wander are lost; The old that is strong does not wither, Deep roots are not reached by the frost. From the ashes a fire shall be woken, A light from the shadows shall spring; Renewed shall be blade that was broken, The crownless again shall be king." - J.R.R. Tolkien
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