Please choose the correct ending to complete the given sentence: Travel: [header] How to train border collies [title] Break the trick down. [step] For instance, the command " stay " can be broken into a number of steps. The first step is to teach your dog to sit and not get up until you tell her to.

Ending1: Then, you can move on to staying for a short time. Next, move on to staying for a longer period. Ending2: Then, then, push her hind legs to the bottom of your lap. As your dog sits, push her forward until you hear the word " stay " and encourage her on once she sits. Ending3: It's still important to train your border collies to always sit, as without sitting, they cannot obey. [substeps] Teach your border collies to raise their legs high in the air. Ending4: Then, you gently let her down and tell her to get down again. You can try to motivate her by saying something like, " stay! Sit, sit! " you can also offer her a treat instead.

Answer format: ending1/ending2/ending3/ending4