The option to register dogs online is currently unavailable. You must call into the clerk's office to pay any fines. 978-630-4058 Note: Dog Licenses are due before March 30th. Each dog licensed after March 30th will be charged a $10 late fee in addition to the cost of each license. Males/Females not fixed: $16, already includes a $1.00 mailing fee. Neutered/Spayed: $12, already includes a $1.00 mailing fee.