Hi,
Has anyone used one of these collars on a dog with metal clips and screws in their leg. I am not sure if this will be suitable if the magnets interfere with the metal, or is this not likely to happen

Not a dog :) but my husband and I were involved in a trial of magnetic therapy conducted by the NHS some thirty odd years ago and at the time he had metal pins in his legs as did a few others that we knew on the trial.
I might add the outcome of the trial showed no evidence that the magnetic therapy helped us nor, as far as I am aware, has any serious study ever since shown evidence of any appreciable benefit hence the NHS have never used it despite not being averse to adopting alternative therapies that have shown evidence.
However, nor does it appear to do any harm (apart from some exhorbitant price charging :)).

I suggest that you contact Bioflow direct.  I'm sure they'll know. :)

They also offer 100% refund if you buy one of their products and it doesn't work for you or your dog.  Nothing to lose if they say that it's OK with metal. :)

My Sadie had a metal plate in her leg and screws and had a bioflow collar,I got hers from the bioflow stand at crufts  and they told me it would not cause any problems in fact I am sure it helped her with mobility,I have now passed it on to my 9 year old lab.I am told the magnet lasts for 100 years.

Sheila

Many thanks all.
I have heard back from Bioflow and they guarantee it will be ok with any screws/metal ties etc. I know this worked wonders for my GSD and meant I could stop all the pain medication. I am hoping this will help my little terrier after her Luxating Patella op recently, to prevent the pain in the future.
I have heard many times that this doesn't help humans, I bought a bracelet for me and I really didn't notice any difference. Maybe we are looking for change and turn off mentally so that this makes it not work, but animals are not aware of what SHOULD happen and therefore they don't fight it and call it mumbo jumbo like I / we do