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.
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)