It was ok, I was annoyed by the other noises from the mic. The tittle was very misleading the only refrence to the zoo at all is the weird looking dog and last time I checked dogs are not displayed in the zoo. The granny was quite humorous but, the person doing the voice should be careful not to bump into the mic which can cause irritant and unwanted noises.
The art work was good but I feel you can do better I can feel the potential building up inside of your hands waiting to produce art worthy of Gods but for now it is alright. The voicing was a little off but not to bad you don't seemed very experience, so I think down the road the cartoons will gradually get better and better as you start to find your flow. I don't know what type of mic you are using but try to not to bump the mic or speak to close to it to prevent that interference.
The characters developed well in a short period of time you have Billy a kid with a simple mind who is amazed with the mechanics of a push pop device. Granny is a strange woman who needs lotion but we dont know why (the sounds in the back while she is using the lotion and her groaning at the end can help us make an inference to what she is doing). The dog is kind of throwing a monkey wrench in to the whole mix. It seems the dogs whole purpose is to tell us the flavor of the lotion and to add that randomness into it all.
Overall I did not find the story that great and the person who voices granny has to make sure they arent so close to the mic. The story did not make to much sense and the voicing was off. Voicing of bill wasnt bad and I like the humore from granny. I look forward to your future works and I hope you will start to develop your self as a cartoonist and I can't waot to seem of your future works.
Here is a quote of inspiration_____" A man paints with his brains and not with his hands."~ Michelangelo