Is a pig-shaped money box haram?

Today I went into store and saw a very cute and big money box, but it was a pig shaped money box. My wife told me not to buy it, as its a pig shaped? I understand she is more religious than me but isn't it a overkill of telling someone you can't have a money box because it shape is in pig form or wearing a shirt that have pig on it. Do we Muslims push our boundaries?