Endurance and Understanding

Joseph is described as an ox.
And one’s reward is that he merits
to receive a canopy of honor, as did Joseph,
Joseph is a fruitful vine,
a fruitful vine by a fountain;
its branches run over the wall.

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The branches over the wall allude to the canopy.
The donkey alludes to meriting the portion of Issachar,
who is described as a donkey,
Issachar is a large-boned donkey

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Another idea: His enemies will fall before him
just like in the blessing given by Moses to the tribe of Joseph,
His horns are the horns of the wild-ox,
with them he shall gore the nations,
even to the ends of the earth
And he merits the understanding of Issachar,
And of the children of Issachar,
men that had understanding of the times,
to know what Israel ought to do