The strongest regulations though are only in certain blocks called HDB which are social houses. There you are allowed only one dog of a certain breed. I think this is more for noise prevention and hygiene purposes. its in fact better than in many UK places where pets are banned outright.
Anywhere else in Singapore you can keep most breeds of dogs, but unfortunately most bull breeds were banned from entry in 1991. However I think the ones already there, including pups were allowed to stay for the rest of their lives provided they were sterilised (of course by now I doubt there are any left).
A lot of SG regulations are again due to size and space, its a tiny country into which they put about the same population as the whole of Scotland!
