- Fridge Brillance: Even though the poodles are just as cartoony/sentient as Snoopy, none of them can walk/dance on their two hind legs for long like Snoopy (along with his family) can (Fifi is only shown walking briefly and only when she is holding Snoopy's arm). Charlie Brown often expresses how Snoopy doesn't act like an ordinary dog like everybody else, so it makes sense there are some things Snoopy can do that most other dogs can't.
- This also makes sense that people would be wowed by Snoopy's circus tricks even more.
- Fridge Sadness: While it may seem mean of Fifi to leave Snoopy for the circus, breaking his heart, it actually makes sense. If she grew up in the circus all her life, she might still have an attachment, even if the owner was treating her badly. She also would have no place to go if she went with Snoopy if she was raised to be a showdog, and it's unlikely Charlie Brown's parents would accept another dog living with them. This also makes the ending sad for Fifi, as she has no choice to go back to that circus even if it will continue to treat her bad.
http://tvtropes.org/pmwiki/pmwiki.php/Fridge/LifeIsACharlieBrown
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