Found this link:
Pregnancy Termination for Dogs | eHow.co.uk
Im thinking maybe it is this that the OP is talking about
:
Pharmaceutical Termination
Prostaglandins are the modern choice of pharmaceutical for use in canine abortions. Prostaglandins are synthetic hormones that are administered to the dog by subcutaneous injection. Multiple doses of the drug are given to the dog over a period of five to seven days. This hormone stimulates contractions of the uterus and causes the mother to expel the products of conception.
Common side effects of prostaglandin treatment include vomiting, diarrhea and excessive urination. While uncommon, cardiovascular collapse is a side effect of prostaglandin treatment. Thus an IV tube is inserted in the initial phases of treatment in case fluid therapy or other drugs are necessary.