How to use 'filetype'?

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I'm looking for GIF files showing the cartoon characters Tom and
Jerry. Actually I want *animated* GIFs, but so far I haven't even
found an efficient way of googling for *all* such GIFs.

After reading some notes on 'advanced Google searches', I tried
filetype:gif jerry
filetype:gif tom
but I was surprised to find these produced very few hits. Even
filetype:gif cartoon
gave only 5 hits!

And some of the hits I'd found by standard arbitrary searches were not
found by filetype:gif. For example, this one
is not found by
filetype:gif tomandjerry

Why not? Am I not using this correctly?

More important, how would I best construct an efficient search please?

Terry, East Grinstead, UK

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