ID: Red bugs on Yarrow
I found a few hundred very small red/brown bugs on my yarrow plants and wanted to see if anyone here can ID them. When the bugs were touched they left a red "blood-like" fluid behind. This is the first time I have seen such a bug and wanted to make sure that this bug is not dangerous to us or our dogs. PIC ATTACHED.
Thank you in advance.
Here is a link that might be useful: