The council adopted a tougher dog control policy last year but it was only in place for the last 22 day of the reporting period.
Mr Nicholson said it might take a while to see a new approach reflected in the figures.
"We're doing the hard work now and, hopefully, the result will be that we have more of a compliant community."
Councillor Ray Stevens said writing off fines once dogs were registered was being "too nice".
"If you haven't done your dog on time, then bad luck - you pay the price."
But Mr Nicholson said getting the dogs registered was more important than scaring owners away.
"We want them to register their dogs as a priority so we know where these dogs are - an infringement is an effective way of doing that."
In the year to June 30, there were 6627 dog-related complaints in the district, with barking dogs being most common. There were 374 dog attacks or rushes.
Mr Nicholson said barking dogs were not priority for three staff on a 24/7 roster. Animal control would need more resources to attend all bark calls.