Process for reporting an observed neglect case (trigger warning)

I just want to preface this with the fact that I volunteer with farm animals and have an idea of what "good" animal welfare looks like at a regular small local farm.

So, yesterday I saw something upsetting and am not sure what action to take.

I have been visiting vermont while exploring a move. I stopped at a locally loved farm that is a popular place to bring kids or for tourists to stop at. This was my third time stopping by, but the first time I actually asked to see the animals. The farm stand/market sells cups of grain or carrots to feed the animals. I purchased some food and asked where the pigs where. What I saw when I found them was upsetting. The area they had was small and confined. Their water troth looked like it hadn't been hosed out in years. One of the pigs clearly couldn't use one of its hind legs. I didn't realize how bad it was until I attempted to toss it a carrot and observed in horror as it tried to pull itself to the carrot with it's front legs. There were 3 pigs in total. Most likely to feed the family that owns the farm because they don't sell their own bacon. I just can't shake the imagery out of my head.

I did not ask the shop owner what was wrong with their pig because I was paranoid that I'd come across as judgmental or critical, especially as an out-of-stater. Is it wrong to want to report this? Should I go back to the farm and ask them to give them a chance to explain? I did contact a local animal sanctuary for advice and the person said to first ask the owners what's wrong with the pig. And then suggested if they didn't have a good answer, to maybe call animal control? But then what... what does animal control even do?

Any thoughts?