Sforno on Exodus 8:26/ספורנו על שמות ח׳:כ״ו

1ויעתר, in order for G’d to remove the wild beasts at the time which Pharaoh had requested and in the manner he had asked for. We know that this time Pharaoh did not want to have to contend with the stench of the dead animals as he had had to when the crocodiles died on his territory, but that G’d made all these beasts retreat to where they had been before they had invaded the urban areas of Egypt. (compare verse 27)