My Dog has red direa with what looks like clumps in it . She is a mix black lab.?

Look at her gums, if they are white, she is having a bleeding problem, Im a nurse for humans.. but my suggestion hun, if it is clumping, (is it black?) probably clots she has a bleed higher up in the belly a GI bleed somewhere... I would take her to the VET pronto... with it being bright red, she is bleeding lower as well. Check her gums though, if they are white, she is in trouble get her there quickly.