Welcome to YT! Bless you for rescuing those precious babies! As for the picky eaters... if they are just 5 months old they are still teething and might have problems with dry food or, of course possible with Yorkies
, vice versa. Also they could just be full. Our Maggie is very picky too and on top of that highly allergic to a gzillion things, so what she likes she cant have and what she can have makes her walk away from her bowl. We are now feeding Orijen Cicken for Adults and so far so good everydoggie likes it. We also free feed since every one of our 5 has a different hunger time... wel... not Mylo, he can eat anytime and everytime... LOL!