Guys - remember there's more than one farmer on here, please!
In my experience, most farmers - not some,
most - really care about the health of their livestock. Some of them also care about things like mental wellbeing, as I know that many smallholders do, but the majority take great pride in producing good quality, healthy stock.
Because of this, most farmers would much rather supply their neighbouring small-scale farm / smallholding with appropriate meds and even help in using them, rather than have said neighbour's stock suffer - and potentially pass on any ailments through the fences.
I know there are exceptions, and because most 'proper' farmers have a lot of livestock, the consequences of getting it wrong can be horrendous and are often newsworthy. There are also smallholders who fail to look after their stock appropriately, often through ignorance, sometimes because it's actually quite hard to get hold of small quantities of appropriate meds, and sometimes through negligence. There's even a thread on here right now about how it could be better policed.
FW is of course correct that it is always best to go through your vet - assuming that your vet has appropriate competence in the livestock in question, which is not always the case for smallholders and small farmers; sometimes there simply isn't an available agricultural vet nearby.
Yep - last week I went to watch a hill farmer friend of my neighbour's dag and to see what meds he was dosing with and heard my neighbour (in welsh) questioning his use of one with 'isnt that for cattle?' reply - yes but it should be allright'.....
Without hearing the hillfarmer's version of that story, we can't be sure that it wasn't the hillfarmer's vet that had told him it would be ok - goatkeepers on here will be well aware of there being many meds that are actually not licensed for goats but which the vet can be authorised to be used for goats. Similarly, our vet will advise us if we can use up any spare cattle meds on sheep, which could be what had happened here.
Please don't jump to conclusions that all farmers are likely to be bad. Most of us are genuine, care about our stock, our land - and our neighbours.