If this is some kind of severe separation anxiety, they do have doggie Prozac. I googled and interestingly vet Prozac is usually more $$$ than human generic. An option I wonder if a vet can write for stuff to pick up on the $10 for 90 days plan and you should even get multiple doses out of each capsule with a little dog. I see target has 4 dollar dog generics which I would think are formulations made especially for pets. Dose is 1/2 to 1 mg/pound/day
Here is the FDA approved study.
http://www.fda.gov/downloads/AnimalV.../ucm062326.pdf
Inappropriate defecation is listed as a studied behavior. All dogs also were in a behavior modification group. Dogs in the placebo group improved but the medicated group was consistently more improved. Over the 8 weeks study period the improvement continued to increase.