I looked up this information for myself when it could have been an issue for my dogs.
What I found out is that it depends on the species of jellyfish, there are a lot of species and variance within each genus. Certain ones cause no harm to us or to dogs (one of this type, luckily, is predominant where I live) but other species do cause harm. I'm sorry, but you will need to find out more information as to the species involved as general advice could be misleading. I googled the area I was in and jellyfish photos and identified the one I was worried about.
All the best.
What I found out is that it depends on the species of jellyfish, there are a lot of species and variance within each genus. Certain ones cause no harm to us or to dogs (one of this type, luckily, is predominant where I live) but other species do cause harm. I'm sorry, but you will need to find out more information as to the species involved as general advice could be misleading. I googled the area I was in and jellyfish photos and identified the one I was worried about.
All the best.