Animals that pull a vehicle must follow certain rules when traveling on the road. These animals, along with livestock and other pack animals, must travel on the **right shoulder** or, if there is no shoulder, as close as possible to the right edge of the road. This ensures that they occupy the least possible space and do not interfere with regular traffic.

Regarding the **continuous horizontal stop lines**, these are traffic signals that indicate to vehicles that they must stop before crossing them. Animals that pull a vehicle are not allowed to cross these lines, as they must follow the same traffic rules as other vehicles when it comes to stopping at stop signs. This is important to maintain road safety and prevent accidents.

Therefore, the correct answer is that they **cannot** cross the continuous horizontal stop line.