Guild Wars 2

i have a question. it seems that while I’m in the sylvari area that fern hounds can have puppies. my question is are they able to reproduce away from the pale tree? if so why can they but not sylvari themselves?

Sylvan hounds are born from the Pale Tree, and only from the Pale Tree. The difference is that they are born small and grow up. They do not reproduce (at least as far as we know). There’s a heart at Danador’s Kennel which has explaining this in a bit more detail and notes how even sylvari aren’t sure why.