Searching english words with uppercase first letter

[joobei]

Something interesting happens when I search for "Apple". The results list has four words before apple:

Apply
Ample
Apples
Applet

then Apple is fifth. If instead i search for "apple" with a lowercase a, then Apple is first. The same happens with all words that start with uppercase. If you search for "Dog" then dog isn't even on the first page of results. I was wondering why that is.