it is going to depend on where it is leaking from
No, you don't have to replace your sink, you just have to replace the fixture's seals. That will stop the water from leaking.
Buy a fence.
potty train it
your water is starting to break
Wash them after they use the bathroom. Simple doggie shampoo or dish soap will turn it white again
eat carrots
That depends on what is leaking. It may be precum and masturbation or sex will stop it. May be urine and there is a physical issue or an infection. May be a STD and some antibiotics are called for.
It depends on why it is leaking.
Most stop leak additives do nothing but empty your wallet. Replace the gasket that is leaking.
To stop a leak in virtual families you drag him/her to the big red tool cabinet in the work room and it will say fixing leaky sink. :)
how do you stop oil leaking from a 2000 sportster primary cover