Pat is an old Apatosaurus who only appears in The Land Before Time X: The Great Longneck Migration. He has not appeared since.
Pat is shown to be a lonely traveler, as he offers twice to look after Littlefoot's friends, takes a different route to the crater, and does not travel with a longneck herd.
He is gentle, but because of his age he is physically weak, being rammed by one sharptooth and pushed over by another, with the latter happening because of his poor skills at fighting sharpteeth.
He appears and asks Cera, Ducky, Petrie and Spike if they need help getting to their destination after just escaping a Gray Sharptooth. They say no, so he continues moseying along. When Cera nearly lands in rapids but is saved by Pat, they realize they cannot make the journey by themselves. They allow him to help them on their journey.
Later, near their destination, he tells them of the Longneck creation myth. At the end, however, his leg is severely burned from erupting lava. He tells them to go on without him, but they refuse to leave him. He is shocked but happy that they decided to stay with him.
An Orange-Brown Sharptooth presumably attacks them offscreen the next morning, and chases Cera, Ducky and Spike, but not Petrie, as he found Littlefoot and Shorty at the crater. The sharptooth chases them to the three, however, and it chases all six of them. Pat rams the sharptooth out of nowhere, knocking him into a tree and causing it to fall on him. Pat tail-whips the sharptooth, stunning it for a few seconds, but he falls because of his burnt foot.
As the sharptooth moves in for the kill, the kids use rocks to keep it down. They try to help Pat up, but the sharptooth gets up and rams Pat to the ground. It moves in again, but then Bron shows up to help. After Bron is bitten in the leg, Pat comes back, distracting the sharptooth, allowing Bron to kick the sharptooth, causing it to roll downhill. Afterwards, two more sharpteeth join the fight, including the Gray Sharptooth from earlier. It battles Pat, with Pat slapping it with his tail, angering it. It knocks him over, but Cera and Shorty save him by ramming the sharptooth and getting under the sharptooth's foot, making it roll down the hill.
At the end of the film, the children ask him to come with them to the Great Valley, which he slowly accepts. He has not appeared since in the further sequels.
- Pat was voiced by James Garner, who also voiced many other famous characters.
- Pat's name is a reference to his species, Apatosaurus, just like Bron is a reference to Brontosaurus, a related sauropod, even though Bron is still an Apatosaurus.