When some living being like dog or any mini bacteria are killed, since they are not self aware or concious do they feel the same type of pain as we do? what is the difference between their suffering and our suffering?
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Dogs don't forget pain. You only have to look at a dog that has been continuously beaten and then cringes or tries to bite anyone who tries to pet it. Yes it has become an automatic reaction but there must be some kind of memory there about humans not being trustworthy.
Its very clear that dogs are conscious and feel the same pain as humans do and the suffering is the same suffering 

If by self aware you mean mindful- than most people arent mindful 99.9999% of the time --- many many monks if good ones are not mindful most of the time

About bacteria i cant say much