I think you're referring to Foster's Home for Imaginary Friends
Pink paw prints are associated with the cartoon character of the Pink Panther.A blue puppy paw print is the symbol of Blue, from Blue's Clues.
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Droopy ; see related link below to a video to see if this is the character in your question .
Owswald, the lucky rabbit, was a character before Mickey mouse. He is black and blue. I don't know any others.
Bo on the Go!
Stimpy
Sonic the Hedgehog
Pink paw prints are associated with the cartoon character of the Pink Panther.A blue puppy paw print is the symbol of Blue, from Blue's Clues.
Linus
The Smurfs
John Byner voiced both Charlie Ant and Blue Aardvark .
BMO is a blue video game console/computer on the Cartoon Network show Adventure Time.
Lance is on Sym-Bionic Titan & the blue-clad character on Voltron
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the blue knight is the best but my favourtite is the bear
Yeah. Im attracted to a cartoon character lol.
A Smurf (a blue cartoon character) is spelled 'un Schtrouph' in French.