The farmer at Puerto Rico lets you use it when you arrive there.
say you need to borrow it.
Talk to the farmer who rescues the balloonist at Puerto Rico. He lets you use the jeep whenever you are there.
Cut the lock at New Jersey with the bolt cutters from Puerto Rico (they are at the upper left star on the jeep map).
There do not appear to be any sheep anywhere on Cryptids Island. There are many goats at the Puerto Rico location, and part of the plan to catch the chupacabra involves using them as bait. After first testing the fur from the barbed wire fence, return to Puerto Rico to use the jeep to corral the three spotted goats at Snaggletooth Rock.
The farmer lets you use it at Puerto Rico.
There is no wrench on Cryptids Island. At Loch Ness, click on the left tire, then click and hold the valve stem to let the air out of the trailer tires. At New Jersey, you can cut the lock from the dumpster with bolt cutters from Puerto Rico (upper left star on the jeep map).
you have to take your jeep and heard them by the grass
There are several. The main one is the farmer that lends you his jeep.
You have to use your jeep and you got to push them in the area with the big rock(s).
You borrow the jeep to drive to the farms in Puerto Rico. At the upper left star, you can find some Bolt Cutters. At the right side star, you bring some feed to the jeep owner's brother, and get some fur from a wire fence, which you can go back and check the DNA of.
After you take the fur from the fence back to Mews, come back to Puerto Rico and steer the jeep to corral 3 spotted goats at Snaggletooth Rock (the center star on the map). Once you have 3 in the center, get out of the jeep there and go to meet the farmer.