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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
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I think you fixed your code already, but for the benefit of others, the output dog.toString() needs to change when the name is changed. Your version of toString() returns a string that never changes.
toFixed() returns a 'string' and you need to return a number.