If they are extending their necks and chattering, that's their way of greeting you. If they are stretching their necks and hissing, well that means back off
You can probably tell the sexes on them if they are all chinese by three months or so. You'll probably have to post new pics here, but I'm sure you'll be doing that anyway.
Temperament: Ganders are usually more outgoing/aggressive, it's worse if you make them 'pets'. If they are somewhat scared of you, they won't be as likely to attack
Geese (females) are usually more shy/standoff-ish, the only time my goose tried to get me was when I was messing with her nest. The ones I have now were not 'people-raised', so they hiss at me when I'm loving on 'their' babies (that the stole from me
) but they don't try to bite.
Geese don't really like dogs, mine bite any dog that gets too close. Usually it's not a problem, but one of the dogs (at least) likes to bite back. So you'll need to train the dogs to stay away or keep the geese penned.
Egg-laying: Geese will often lay the season after they are hatched (season being approximately March through June for most breeds). The goose will lay an egg every other day usually. Just like other birds, if you take the eggs, she'll continue to lay, but geese don't lay as long as other birds.
Diet: Geese are strict herbivores, they will eat mostly grasses when available. Mine, even my young ones, eat very little feed during the non-winter months.
