they def change...Daisy was very dark looking when we first got her @12 weeks (she was black with a lil bit of blonde on her ''cheeks'' and her tummy) and of course her ears were ''floppy''..
@ around 6 , 7 months her ears went up and she lightened up abit (she's now 8 months and even lighter..blonde and silver)
so the first pics she was about 4 months and the second pic, her ears were goin up and down on different days

and the last two pics were @ 6 months.