Condo/expat areas are the entire island of Singapore. There are no enclaves here like in some places. The closest thing to an enclave would be Holland Village but today that only has maybe 10% of the expat population if that much. Most are scattered all over the island depending on the lifestyle they want to live. Those with a penchant for pubs & the nightlife tend to go for places in/near the CBD. Used to be Holland Village had a corner of the market, but since the American moved the American School to the North side of the Island, huge chunks of Expats (not just yanks) have moved to the north. The east coast is also popular due to the proximity to East Coast Park (which is dog friendly). Also Bishan in the centre of the Island is becoming popular as there is a large dog friendly area in Bishan Park (area of the park is specifically for dogs to run unfettered - with certain restraints depending on the breed of dog). Large dogs & certain other breeds require muzzling and outside of special areas, all dogs are required to be leashed.
Landed
property, while expensive, is more affordable on the outskirts of the CBD. The further away from the city centre the more affordable and in areas like Yio Chu Kang you may find terrace or cluster housing within your budget. This site is a good place to start when looking for housing.
Most
condo's/landed properties are pet friendly, but you should ask just to make sure. Usually if they are not, it will be specifically noted. (Of course, the owner, on the other hand, may not allow pets, but that's something else again as is within their right even though it may not be the condo management committee's view of the condo in general.
sms