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.
I think that (according to Buddhism) humans, animals, ghosts, and residents of hell all belong to the same kind of category: all "[sentient](https://en.wikipedia.org/wiki/Sentient_beings_(Buddhism))", all composed of the five skandhas, and all subject to suffering.

Since all belong to the same continuum (i.e. samsara), I expect that they all "lose memory" and that their "suffering finishes" in much the same way.

I don't consider a dog as like a bacterium, by the way: IMO a bacterium is more like a plant than an animal. I think different schools of Buddhism differ on whether plants are "sentient" and have any "consciousness".

**don't they just forget or loose the momory of their suffering after it is finished?**

Isn't that more-or-less true (or untrue) of people too?