I've had horses for years but due to work I've not got the time to have my own.
Through a friend of a friend I've been part loaning the sweetest mare a couple of days a week for six months. Teenage daughter and her none-horsey parents.
I know she's not my horse and I've got no say in how she's kept - but have given advice when asked and also when not and it's fine if they don't listen.
But now, this poor sweet mare's welfare is being compromised. Owners won't accept there's a problem. Vets been out but owners are choosing not to treat and to "see how she goes". She's becoming more and more obviously lame, yet they don't see a problem. Not even beginning to mention she hasn't seen a farrier in what is now 5 months 
I'm going to have to walk away as I can't stand back and watch it happen. I worry about the horse but what else can I do? Am I doing the right thing?