Yes.
Another VN here - qualified in the early 90's, and a horse owner since my teens. I have had horses and dogs all my life, and have added chickens in the last 7 years. Along with books and internet, I have kept a happy flock of no more than 10 at a time, and my oldest girl is 9. I've had fox issues, and learned about mites, and how chickens will think little polystyrene beads are snail eggs and eat them, and that birds of prey are as likely to take them as a fox is. I moved into sheep last year, and have 4 lovely Wiltshires who met a nice Wiltshire chap this winter. I am hoping for the patter of little feet later in spring. I also gained 4 Zwartbles ladies, already pregnant, and 8 lambs soon joined the household. The 4 ladies are now retired, and the lambs growing nicely, and I gained a huge amount of help and information from this forum ( and others, and books, and the vet ) when we had a mastitis issue. I also learned that being flattened by several large sheep while trying to put feed in their trough, doesn't just happen to me !
I am lucky that I have a great local vet surgery that offer phone advice, and also run regular small-holder meetings to discuss issues, and do workshops such as sheep footcare, basic lambing tips, and talks on worming and vaccination. They do discounts on ""Lambing boxes"" to let people stock up on gloves, gel, antibiotics, stomach tubes, iodine etc - and also give advice on using them. I would feel my vets would be not doing the best they could, if they saw something I was doing/not doing that wasn't good for welfare, and they didn't mention it. In fact they are already telling people they know to have chickens, about the current issue with bird flu in the south west of the UK, and the potential connotations.
Cruelty by omission or lack of understanding is still cruel to the animal, even if there is no intent to be cruel. I've seen enough flabby pets brought in with arthritis, and breathing issues, to know that over-feeding can be as bad as underfeeding, and having now owned sheep - how hard it is to get an idea of weight/condition by sight alone. And how quickly a week of rain and cold temperatures, coupled with diarrhoea and not recognising that the grass ( still looking green and plentiful ) doesn't actually have much nutritional benefit in winter, can drop a sheep from a pudgy 3 to a barely 2, in a matter of days.
Whoever it is - owner, vet, worried passer by, concerned neighbour - speak out and try to improve the situation.