pls help me ! question regarding westie

hi there ,
i am planning to getting a westie and doing research, homework now. i know that, for sure , westie can live in HDB flat without those kinda licence. but while i was searching for more website , i came across a website of westie that say westie is NOT SUITABLE TO LIVE IN FLAT < NOT EVEN A APARTMENT , it say that westie must have a medium yard to run. is it true?? i am not sure about it . someone help me pls ? if that is true , i will givve up having a westie . ='[