engagement gift for brother? ideas? help?

[talentdeficit]

my brother got engaged last weekend and is having an engagement/house warming party (him and his fiance bought a house together a couple of months ago) on friday. i've been told engagement gifts aren't really traditional and i should just show up, but i dunno, i think i should get him something. he is 25, his fiance is 23 and neither of them drink at all. they both play a lot of soccer and love animals, especially their dog (a shepherd/rottweiler cross). any ideas?