My only concern in adopting an older dog is not knowing their history and therefore previous influences on the dogs behaviour. Do you know Lexie's history? Your kids are a bit older and so probably a good age to adopt an older dog. I wouldn't be concerned about the vet bills, but I would want to be comfortable that the dog has not been mistreated in the past and doesn't exhibit aggressive behaviours.
If she's got no known health issues you can get pet insurance for the dog. You'd be giving her a happy ending, and she'd be giving you some unconditional love
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