Dogs can detect molecules on the order of a couple parts per million, far below our level of detection. They can also smell cancer, and can tell the difference between different kinds of internal cancer just by smelling the skin.
And your point would be? If I dilute alcohol to the limits very of detection will it still get me drunk? And what of the homoeopathic solutions which have been diluted to the point that they don't contain a single molecule of the original active ingredient?
The burden of proof is on you. There's no body of evidence to suggest homeoeopathy has any effectiveness beyond the placebo effect. NOW is when you provide the evidence and claim your Nobel prize for discrediting a fairly important scientific principle (i.e. that you need a cause for a chemical effect).
They have also been shown to be able to predict seizures, and hypoglycemic attacks.
And this matters because? There are physical precursors to seizures so it's entirely possible that a dog might be able to detect them. That's neat but how is it relevant to homoeopathy where any active ingredient has been made absent?
Most of what dogs can do we dont know how they do it because we cant detect what they can.
Er, what? We know how dogs detect those things. The chemical receptors in their noses aren't that difficult to study. There's no need to make it out as some kind of spooky trick they have.
Just because we cannot detect low levels, doesn't mean they are not there nor have any effect.
We've got lots of evidence for lowering levels reducing effects and none for lowering levels increasing effects. The burden of proof is on you. Step up and actually show it and you'll be in every chemistry textbook printed in the next thousand years.
Perhaps it's my turn to be a dick: [citation needed].