Oggy and the Cockroaches (1999)

S1E9 A Dog Day Afternoon

After Oggy returns home from shopping, he stumbles over a tiny puppy. He brings the little creature inside and starts amusing himself by squeezing his own nose like a toy for the pup. When Jack shows up, he quickly suspects that Oggy's lost his mind, especially since he can't see both Oggy and the puppy at the same time.