This has happened twice. Both times at meetups. Once at a dog park, last time at a home. Uni looks like she just drank a bunch of water, but if you look closer at her mouth, it's all drooly and a bit foamy. Both times we wiped it off and her fur dried in a few minutes. But what is it from?
These episodes are not like the time she ate a Thai curry noodle off the floor and had saliva drooly mouth for a week. That, I know what happened.
Why is this happening? Do you think she is allergic or eating grass? I have personally not seen her eat grass with my own eyes. She does not get like that everytime she gets on grass. In fact, just at meetups.

she has had playdates with Kaji and it didn't happen, just when there are lots of other dogs around. Anyone ever heard of such a thing?