A clock cartoon show usually has visually appealing designs of clocks, maybe with personalities. It might incorporate stories that help children understand how to read a clock and manage time in a fun way.
It could symbolize time pressure or a race against time. Maybe it shows that the characters need to hurry or that there's a limited time for something important to happen.
A colorful clock cartoon with transparency might have bright and vivid colors, a clear clock face, and a see-through background that makes it stand out.
Maybe they could be elements in a children's book or a game. For example, in a cartoonish game, the cat has to reach the cuckoo clock within a certain time to win. Or in a children's book, the cat dreams of a cuckoo clock in a cartoon world.
It's hard to determine for sure. It could be a visual cue for a lesson on punctuality, or it might be a creative expression without a deep meaning. We'd need more context to understand it fully.
You could look on dedicated graphic design platforms such as Canva or Freepik. They usually have a good selection of cartoon clipart, including stressed out clock ones. Just make sure to check the licensing terms before using.
The dog might not be able to wake the cuckoo clock because there's some sort of magic or rule in the cartoon world preventing it. Or it could be that the dog is having a bad day and just doesn't have the energy to do it.