I am sorry but what kind of vet did you talk to? That sounds absolutely arcaic! I have never heard of that. Bug killer on a wound the doctor hasn't seen near the anus of a very very tiny kitten? What in the world was that vet thinking?
This is upsetting.
Assumptions do nothing but make an ass out of u and me.
We can stick our heads in the sand for only so long before it starts choking us. Face it folks. The pet population is bad ALL OVER THE WORLD!