Yes, I did knit a sweater for my dog.  And it didn't come out the right size because I made it before I figured out how to calculate the correct size.

 

I made a pair of mittens.  They didn't come out the same size.  And they're really a much different color than in this picture.  The ribbing on the cuff is so loose they fall off my hands, so I don't wear them much anyway.

This is a magic scarf I made.  It's a magic scarf because you knit this little tiny scarf then you let every other stitch unravel and poof! It becomes a long, skinnier, lacy scarf.  The colors are actually really pretty in real life.  I made a matching hat, but I couldn't find it when I took this picture.