Love the name, love the product, it may feel like forever but the stage will pass, William was a determined nipper, and we found a playpen so useful for time-outs when we all needed a break.
Also I have a 4 year old son who loves dogs and was so excited to get Merlot however he is forevernipping his feet.
I would try and dissuade your four year old from biting Merlot's feet, although come to think of it a bit of payback may work
only kidding.
Even tho' puppies can make you want to scream, try not to get annoyed, ignoring them, and removing them from the situation really works best, but easier said than done at times.
I looked back at a post I made when William was five months of age, you may find it resonates
http://www.cockersonline.co.uk/discuss/index.php?topic=96349.0I hasten to add that William has now matured into a fine companion, persistence and consistency in training pays dividends in the end.