Oh no, not all posthuman,
No, that is not at all what the Scripture implies. In fact it declares that animals are not "help meets" for Adam: "...and to every beast of the field; but for Adam there was not found an help meet for him."
The below Scripture speaks of two separate subjects, and it simply lists, in order, the events in the Garden.
First was Adam, he was alone.
Then God made DOMESTIC animals, but Adam was still alone.
Then God made Eve for Adam and it was all downhill for him from there.
Just kidding.
Eve was the
help meet for Adam, the animals were made for Adam to use, but they were not companions to him, though he had the dominion over them.
Eve was the last "thing" formed and made by God in the Garden. It was necessary, for chronology's sake, to mention the animals before closing the creation narrative. It would have been inaccurate to mention the animals after mentioning Eve, because they came before her. It would have been inaccurate to mention the animals before Adam, because he came before them. The only logical place to mention them is in-between Adam and Eve. Adam was formed, but he was never meant to be alone, thus Adam was to have a help (companion) meet (adequate) for him. The animals in the Garden were not a failed attempt on God's part to find a help meet for Adam. God knew exactly what Adam needed.
The placement of the statements about the "help meet" that was lacking, and which was to come, simply declares God's intention that Adam was to have a mate. You notice that the "help meet" was mentioned both before the animals and after the animals indicating that the animals were never the intended "help meet." Or else God erred, which of course is a ridiculous premise.
The confuse arises because God had to fit the animals into the creation order after Adam, but before Eve. The Scripture is saying the animals were not the
help meet to come.
Consider the offset verses as parenthetical (one subject placed in the middle of another subject).
Gen 2:18-23
18 And the LORD God said, It is not good that the man should be alone; I will make him an help meet for him.
19 And out of the ground the LORD God formed every beast of the field, and every fowl of the air; and brought them unto Adam to see what he would call them: and whatsoever Adam called every living creature, that was the name thereof.
20 And Adam gave names to all cattle, and to the fowl of the air, and to every beast of the field; but for Adam there was not found an help meet for him.
21 And the LORD God caused a deep sleep to fall upon Adam and he slept: and he took one of his ribs, and closed up the flesh instead thereof;
22 And the rib, which the LORD God had taken from man, made he a woman, and brought her unto the man.
23 And Adam said, This is now bone of my bones, and flesh of my flesh: she shall be called Woman, because she was taken out of Man. KJV
I agree that the way that this is worded in the English from the Hebrew can seem confusing, but remember that often times what is clear and concise in one language looses some clarity when it is transferred into another language.
I assure you that God was on top of the events in the Garden, and that He did not supposed to mate Adam with a cow or a sparrow before He 'realized that this wouldn't work.'
In Leviticus 18 and 20 we see that interspecies sexual activity (bestiality) is forbidden