Hello, this is Dr. Benedetta, and I'd like to help you with your question about Cyndi.
Was the stool that you helped her pass normal? meaning not too hard and dry, not containing grass or other foreign material, like fabric, not bloody?
Sometimes, if the dog ingests things like grass, or a sock or similar, these things can get through the GI, but are then difficult to expel. Or she may be constipated.
The milk can help with constipation, so that was a good move.
I would also recommend to feed a bland low residue diet for the next few days, like boiled chicken, boiled rice and canned pumpkin (about 1/2 tablespoon twice a day) to help normalize her stool again.
I would also have her anal gland checked, if they are too full, they can be part of the problem.
The important thing is to rule out ingestion of foreign material.
Hope this helps, let me know if you have more questions!
Benedetta Sarno, DVM