Rashwor, I understand FULLY. Almost 4 years ago I got a Aussie mix pup and from about 6mos til the month she turned 2 yrs old she ate my daughters trampoline (twice) unscrewed all the sprinkler heads in the back yard and ate them (without digging up the yard, didn't know sprinklers were gone til I turned them on in spring) chewed battery cable on my jeep chewed ext cord used to plug in my truck on cold nights, OH YEAH this dog eats rose bushes / tree thorns and all and never bleeds, and the list goes on.
I have always kept all my dogs for their full life, but this one was pushing her luck. Then I found a web site about ACD (Austailian Cattle Dogs) and I learned a ton plus I lost 60 lbs. I learned that ACD's need 5 to 8 miles of exercise a DAY and so I started riding my bike with her 5-10 miles a night and it worked out well for both of us, and if the weather is bad she will talk to me til I let her run on the treadmill for a while. ACD's are VERY smart, they are considered self thinkers unlike other dogs.