Hmm, I'll bite. There are lots of dog owners here with unripped liners and likely gunite pool owners without cracks close to train tracks. But I am neither of them so they will have to speak up. Fiberglass isn't a bad choice necessarily but you may be limiting yourself unnecessarily.
I can see why you would be nervous about dogs and vinyl liners. I have never heard any feedback on that, I'm interested to hear what people say about dogs and vinyl.
Also, I have never heard about a gunite pool cracking near train tracks. I've heard that there can be some trouble with houses. Does your house have any issues related to the train?
Definitely nothing wrong with fiberglass if you are happy with the available shapes and features.
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