There is a time when a donkey spoke! It's in the Bible! Remember donkeys were called asses
back then.

Numbers22:21
And Balaam rose up in the morning, and saddled his ass, and went with the princes of Moab.
Nu22:22
And God's anger was kindled because he went: and the angel of the LORD stood in the way for an adversary against him.
Now he was riding upon his ass, and his two servants were with him.
Nu22:23
And the ass saw the angel of the LORD standing in the way, and his sword drawn in his hand:
and the ass turned aside out of the way, and went into the field: and Balaam smote the ass, to turn her into the way.
Nu22:24
But the angel of the LORD stood in a path of the vineyards, a wall being on this side, and a wall on that side.
Nu22:25
And when the ass saw the angel of the LORD, she thrust herself unto the wall, and crushed Balaam's foot against the wall:
and he smote her again.
Nu22:26
And the angel of the LORD went further,and stood in a narrow place,where was no way to turn either to the right hand or
to the left.
Nu22:27
And when the ass saw the angel of the LORD, she fell down under Balaam: and Balaam's anger was kindled,
and he smote the ass with a staff.
Nu22:28
And the LORD opened the mouth of the ass, and she said unto Balaam, What have I done unto thee,
that thou hast smitten me these three times?
Nu22:29
And Balaam said unto the ass, Because thou hast mocked me: I would there were a sword in mine hand,
for now would I kill thee.
Nu22:30
And the ass said unto Balaam, Am not I thine ass, upon which thou hast ridden ever since I was thine unto this day?
was I ever wont to do so unto thee? And he said, Nay.
Nu22:31
Then the LORD opened the eyes of Balaam, and he saw the angel of the LORD standing in the way,
and his sword drawn in his hand: and he bowed down his head, and fell flat on his face.
Nu22:32
And the angel of the LORD said unto him, Wherefore hast thou smitten thine ass these three times? behold,
I went out to withstand thee, because thy way is perverse before me:
Nu22:33
And the ass saw me, and turned from me these three times: unless she had turned from me, surely now also I had slain thee,
and saved her alive.

OK now I shall tell you more weird stuff that isn't in the Bible!

There was a pig named Oink.What else would you name a pig? Like most pigs.
He was owned by a farmer named Sloat.He would eventually be killed,sold,and eaten.
but when the farmer tried to come kill him,something weird happened.

Oink:We pigs have kept silent long enough! When will you stop killing us?! 
Sloat:I have to make a living somehow
Oink:Maybe if you would get off your fat lazy butt and grow crops or something you wouldn't be talking to a pig!
Sloat:What?! I'm talking to a pig?! It's talking back! I must tell Splat!

So he went to tell his wife named Splat.

Sloat:Splat! You won't believe what just happened!
Splat:What is it this time?
Sloat:The pig is talking to me!
Splat:Have you been drinking again?!
Sloat:NO!!!! This is real!
Splat:OK,but this better not be some joke!

So they went outside again.

Splat:So where is this talking pig?
Sloat:I don't understand it! He was here!
Splat:SURE HE WAS! Hey wait,why is the gate open?
Sloat:Um,I must have not closed it.I was in a hurry you know.
Splat:You moron! He escaped! We could have used him for shows and been millionares!

There was also a horse racer named Polk.He had this horse named Banana.He made money by winning races.
Unfortunately he wasn't very nice to Banana.One day they were racing but losing.

Polk:What's wrong with you? Can't you go any faster.
Banana:Are you sure you REALLY want me to go faster?
Polk:Yes! Whatever it takes!
Banana:OK,get off fatty!

Banana threw him off and won the race!

Polk:Wait a minute.Did my horse just talk?!

So what can you learn from these stories? Don't mistreat your animals.Even they can't take it forever!