whtsthfrequency
Posted : 1/16/2007 9:17:17 PM
The early developmental stage of the heartworm can indeed cross placentally
However, the worms cannot achieve sexual maturity in the pup because they have skipped the essential intermediate host of the mosquito....so the pup may have some tiny worms for a while, but they will all die quite soon with usually no, or little, complication.