Not definitely - our three weren't allowed outside until their 1st birthday, but since that (they're almost 4) they come and go as they please during daylight hours (we're in the UK where this is normal). All three still play fetch, but only with specific types of toys.

One fetches fluffy toys with feather "tails", one fetches sweet wrappers or bits of paper and one fetches old cat collars (which is very useful - if one loses their collar, he normally picks it up and brings it home for us). Collar-fetcher and wrapper-fetcher get bored a bit quicker these days, but feather-toy-fetcher will play fetch for ages.