No clear single source is documented for this clip, so its identity online comes from the mix of names attached to it rather than one scene or episode. Snoopy is the Peanuts beagle, Pingu is the clay penguin, and the tags also pull in Sonic and BFDI, which explains why it circulates as a crossover meme rather than a straight sound effect. That random combination is the appeal for editors who collect odd mashup sounds for reaction videos, edits and in jokes where recognising every reference is part of the fun for viewers.