it depends....
The nouns in the sentence are leash and walk.
put it on a leash
I took my dog for a walk and used a leash to keep her safe.
You can't get them to walk on a leash normally. This is because they are not dogs and wander everywhere when they are on a leash. You can buy leashes from pet shops but you have to keep in mind that the guinea pig will not follow you, you have to follow it.
No, you do not have to buy a leash for your puffle. You also don't have to be a member to walk your puffle.
Yes. Not out side.
Yes, dogs can walk on a leash in the airport as long as they are well-behaved and follow the airport's rules and regulations regarding pets.
Train it to follow you
Put a leash on it and walk it there.
A video that shows the process of teaching the puppy to walk on a leash
Nope. Just put your dog on a leash and walk it
sit on him/her and put a harness on him/her and grab the harness and put a leash on it and walk the dog