Ok. Do you have some competing literature I could look at that asserts they don't live as long? 40,000 seems like a pretty decent sample pool where differences in care or breed would tend to be averaged out. Maybe people that get their pets spayed/neutered are just more likely to pay for medical services from the vet.
That's not true.
https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0061082#pone.0061082-Schneider1
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Ok. Do you have some competing literature I could look at that asserts they don't live as long? 40,000 seems like a pretty decent sample pool where differences in care or breed would tend to be averaged out. Maybe people that get their pets spayed/neutered are just more likely to pay for medical services from the vet.
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