In the case of preventative medication in order to keep dogs healthy - IMO, they are also day-to-day risks that I have to accept if I am to share my lives with dogs. If the risk was unacceptable to me, then the alternative is no dogs
But a dog can be perfectly healthy (some might say more so

) without using those preventatives

I choose to feed Coco a healthy and natural diet with as few additives as possible, so using chemicals on her uneccesarily would be completely at odds with that.

If she was ill and needed medication then that is a different matter.

I agree with Helen, confirmed or not, I do not want to use chemicals on myself or my animals if I don't need to

Of course there are risks in everyday life but a lifestyle risk eg traffic or adder bites are completely different imo to the use of chemicals for a perceived risk that may not even exist.

With ticks, since the treatments only kill the tick once it has attached, I would far prefer to check Coco over every day and use the faithful O'Tom.

I know of several people who have had ticks attach to them - doesn't mean they should use Frontline on themselves does it?