'The dog' would be le
pa gerku. Normally, we wouldn't bother with the
pa though, unless we
wanted to make it quite clear that we only have one dog in mind. 'The dogs' would be le
su'o re gerku (or lei su'o
re gerku, if we're thinking of them as a group) —
'the at least two dogs'. However, it is hard to
think of many situations where you would need to say this. Like some other
languages (e.g. Chinese), Lojban normally leaves number up to context. You
guessed it — you've just spent all this time learning to say how many
people, dogs etc. there are, and piso'e of the time, you don't need to!
But, like many features of Lojban, it can be very useful when you want it,
so please don't feel tricked.
Oh, what does piso'e mean? That, I will leave as an
exercise to the reader...