I have a Xoloitzcuintle (Mexican hairless) and this time of the year in my part of the world, bugs really start to attack him.
As far as I know there are no commercial bug repellents for dogs, hence the question.
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If in doubt, ask your vet. You should "never ever* use anything made for humans without prior consultation simply because dogs might react differently and because they've got a far smaller body size.
It's certainly possible that repellents or toxins are indeed harmful to humans and dogs, but the dose would be too small to matter in the human case (think of drinking alcohol adults compared to children).
And not to forget there are options for dogs in the form of collars, sprays, food additions, etc.
There might be simple solutions, but we don't know the insects you'd like to avoid. For example, cold pressed coconut oil can be rubbed into the fur or added to the food and will repel ticks and mosquitoes to a certain degree. This even works for humans, too.