I'm sure you've read this information about clomicalm on drugs.com:
Clomicalm - FDA prescribing information, side effects and uses
Clomicalm is a tricyclic antidepressant. It has some side effects, which are listed in the article, along with the percentage of dogs that experienced those side effects compared with placebo. At least there is a picture of a Yorkie on their 5 mg. tablet bottle
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IMHO, the side effects are relatively mild, so it may be worth giving it a try, but watch Teddy carefully for side effects.