My most favorite episode is the one in which Small Dog and Big Dog go to a pet graveyard to bring themselves some bones and Small Dog falls into the grave and the skull of the pet monkey buried in there gets stuck on his head and in the result his companion and the owner of the monkey who come to the graveyard to bring some flowers to his pet think Small Dog is the monkey zombie
When I was watching it for the first time in childhood (I must have been like 10 years old, given the time when it was aired), I didn't know English but for the basics learnt at school so I didn't understand what they were talking about. Quite recently, I could watch it in English once again, this time understanding everything exquisitely well. 