1.   Each female is mated over the course of one week, and little time is spared for feeding.

2.   However, if females had been mated with males whose bodies and hefty sperm packets were devoid of the toxin, the unprotected females were consistently devoured.

3.   These females were then mated either to males that did contain alkaloids or to males that did not.

4.   These breeding farms churn out hundreds of dogs a year, mating females whenever they come into heat.