It can only proc if the lizard lands an attack, stalking slows down the attack speed of the pet, so would be less procs since it'll attack slower. Stalking does not affect the % to proc on a pet

It can only proc if the lizard lands an attack, stalking slows down the attack speed of the pet, so would be less procs since it'll attack slower. Stalking does not affect the % to proc on a pet

Does leveling stalking increase their % chance to land the poison or no?

No

__________________
Computing the probability that at least one of the following events will occur:
P(a or b ... or z) = 1 - P(!a and !b ... and !z) Probability