You can get tincture form by "St. Francis" in most health food stores. You would start to use this as takes a bit of time to start working but is said to work as well as or better then anti-depressants and/or anti-anxiety meds. It is not something you give just before a storm like a typical pill or even melatonin.
This also has so many more benefits to your dogs health, immune health, thyroid, adrenals (stress hormones), antifungal. etc. etc.
Ashwagandha: Stress Reduction, Neural Protection, and a Lot More from an Ancient Herb - Life Extension
For example, in validated models of anxiety and depression, ashwagandha has been demonstrated to be as effective as some tranquilizers and antidepressant drugs. Specifically, oral administration of ashwagandha for five days suggested anxiety-relieving effects similar to those achieved by the anti-anxiety drug lorazepam (Ativan®), and antidepressant effects similar to those of the prescription antidepressant drug imipramine (Tofranil®).
Also note this...you wont find this benefit in a pharmaceutical
In addition to ashwagandha’s documented neuroprotective effects, exciting recent evidence suggests that it also has the potential to stop cancer cells in their tracks. For example, a recent analysis showed that ashwagandha extract inhibited the growth of human breast, lung, and colon cancer cell lines in the laboratory. This inhibition was comparable to that achieved with the common cancer chemotherapy drug doxorubicin (Caelyx®, Myocet®). In fact, researchers reported that withaferin A, a specific compound extracted from ashwagandha, was more effective than doxorubicin in inhibiting breast and colon cancer cell growth.11,14