That would depend on the size of the crate, and the size of the apples.
From the size of the dog they should be in a medium crate maximum.
Maltese
6 to 9 pounds
The weight of a milk crate varies from between four to ten pounds, depending on the size of the crate and the material it was made from.
when a Maltese is born they are barely the size of a cell phone, and weigh about 1lb. (and they're super cute) :)
350
medium
usually around 4 to 11 pounds
A crate should be big enough for them to stand up, lie down, and turn around fairly easily.
half pint or 1 cup
crate it can be large, enormous, small, etc