It’s not just vets it’s plumbing, hvac, medical practices. Small PE funds consolidate a few small ones then sell to a bigger PE fund which consolidates a bunch of those and so on
The back end of all these companies is the same, some call center/scheduler that manages everything very cheap. They run the purchased companies as fronts and jack the prices and push for big replacement/upgrades until reviews dip. Then they dissolve the company into a generic regional company and sell that to a national like servicepro.
I had the same happen with a toilet; the float needed replacement, but the big plumbing firm claimed it'd be better to replace the whole toilet. Toilet was fine.