One of the people I know in PE described their profit margins as being surprisingly high even before PE roll-ups. They said that some PE firms were on a mission to acquire all of the vet firms in metro areas and then drive prices up even further because the demand is so inelastic. There was a secondary rush where people were trying to acquire vet clinics in anticipation of flipping them to PE roll-ups later.
My local vet seems to have gone down this slide. A long time ago it felt like a staff that really just cared about animals and had good prices. On my last visit it felt like I was bombarded with practiced pitches for different products and services at every step of the process. They even added some expensive vitamin product to my bill despite me declining it during the service. They removed it when I caught it on the bill before walking out the door, but only after a last attempt at pitching me on it. I could tell they were heavily incentivized to sell as much as possible. I didn't go back, but at this point I don't know where else to go.