The Bones of Fred McFee by Eve Bunting
Eve Bunting has written way too many books. This is a rhyming one suitable for Halloween.

The Hallo-Wiener by Dav Pilkey
Don't you love how it's Dav without an "e?" This picture book is about a dachshund who is tormented by the other dogs because of how he looks. For Halloween his mom gets him a hotdog costume and he wears it so his mom's feelings aren't hurt. Yada yada yada, Oscar the weiner dog ends up saving the day when all the other dogs are stranded in the pond.

The Soup Bone by Tony Johnston
OK, this book is crazy. A lonely old woman wearing a white bonnet (WTF?) makes some soup and decides she needs to put in a bone because the soup's too thin. So she digs under a tree and eventually digs up a skeleton that comes alive and they become friends.