It’s a Lab, my guess would be that it ate something it shouldn’t have.
He has eaten (and will continue to eat) many things he shouldn't, yep, he is a lab! It was was actually a cancerous lump that was removed 3 years ago, thankfully no recurrence (touch all the wooden things).
@ColinTheBald started
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It’s a Lab, my guess would be that it ate something it shouldn’t have.