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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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?
It is hard to say unless you are an animal or bacteria.
In general observation, it appears animals such as dogs enjoy the sex and they feel the pain.
According to Buddhist teaching animals possess five aggregate same as the human.

Interesting video to watch. In this video, it is explained in plain English that any living and breathing organism has consciousness and how we interpret pain and pleasure.

[Your brain hallucinates your conscious reality | Anil Seth](https://youtu.be/lyu7v7nWzfo)