Hair particles are stretched after posing

Hi frens!

I posed my dog character and as I open his mouth with the rig, it seems that the tip of some hair particles are stuck to the upper lip. I’ll include some screenshots to explain the problem better.
I have tried exclude the upper lip from weight painting completely but that didn’t help.
This problem happens on the interpolated hair particles, so i cannot directly edit or delete them.
Any ideas what could solve the problem? Your suggestions are very welcome.

Solved: I added the same vertex group for length as for density. The rogue hair disappeared.