If it helps your search, I think the animals were presented to him in a sheet.
It is kind of amazing that a DREAM can be the basis for major religious doctrine.
I kind of opine that an all-powerful God could deliver His messages in a more direct method to multiple witnesses.
Or had His Son tell people.
Acts 10:9-17
9About noon the following day as they were on their journey and approaching the city, Peter went up on the roof to pray.
10He became hungry and wanted something to eat, and while the meal was being prepared, he fell into a trance.
11He saw heaven opened and something like a large sheet being let down to earth by its four corners.
12It contained all kinds of four-footed animals, as well as reptiles of the earth and birds of the air.
13Then a voice told him, "Get up, Peter. Kill and eat."
14"Surely not, Lord!" Peter replied. "I have never eaten anything impure or unclean."
15The voice spoke to him a second time, "Do not call anything impure that God has made clean."
16This happened three times, and immediately the sheet was taken back to heaven.
17While Peter was wondering about the meaning of the vision, the men sent by Cornelius found out where Simon's house was and stopped at the gate.