Chain link fence?

I have a almost new condition chain link fence I want to put by the back door for my dog what I need to know is can I use the original hardened concrete from the previous owner and it still be stable or will I have to break it off if I have to break it off do I need to put new concrete in or will I be fine without... show more I have a almost new condition chain link fence I want to put by the back door for my dog what I need to know is can I use the original hardened concrete from the previous owner and it still be stable or will I have to break it off if I have to break it off do I need to put new concrete in or will I be fine without it first time putting one up but it’s necessary
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