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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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
In all [31 planes of existence](http://www.accesstoinsight.org/ptf/dhamma/sagga/loka.html) there is attachment to life except for the plane for [Unconscious Beings (asaññasatta)](https://suttacentral.net/define/asa%C3%B1%C3%B1asatt%C4%81). So a dog feels pain thus like us.

Also any being in any plane are self aware except for enlightened beings who do not have self conceiving.

Also we all lose some notion of suffering otherwise hence why 1st Noble Truth is not readily comprehensible.