Thank you for your response
I just don't use fibronil. This is my puppy's first summer and she hasn't received any medication for fleas yet.
I know for sure it's not fleas because I don't see anything on her skin that looks like it and the vet also checked.
The symptoms are exactly the same as the pictures posted above from
JosselleandLola.
Please note that my puppy doesn't go outside the house at all she's always inside (she's afraid to walk outside).
It's really hard to identify the cause of the problem
Thanks again for your reply.
p.s excuse my english, I'm greek