
A lot of trainers just grow up with this stuff and thinks it's normal, they never think to challenge it :-( I've been dealing with one for a few years now - the first training appointment of hers I was present for was for my Raine, and she advised doing exactly that with lemon juice in water. I stepped in and stopped it happening, and once we were on the way home, absolutely let rip at her. I was furious. Her answer? She'd never really thought about it before! Horrendous :-(
Needless to say that advice and a few other things are *why* Raine is with me - it only took 6 months for an already stressed dog to start going for her owners and to date, 3 years of ongoing rehab to get her over the handling of that first year. The trainer hasn't used that technique since that day though, she is well aware of what she did wrong and why Rai is the way she is, and these days she is a much better trainer - still a long way to go mind you, but she's ditched basically everything she used to do and is a positive trainer now. She's just a bit lacking in technique and body language skills but the dogs she works with are much happier for it.
Sometimes they just need to have their eyes opened - of course some won't listen but some just don't realise the problems with their methods or that there are better ways. When I challenged the above woman about 'teaching' dogs to sit by pushing their bums to the ground (which is why Rai would now snap at anyone who tried to handle her back end), she said she had no idea there was another way to do it!