The decision to discuss the pound plans in private raised the hackles of councillor Dave Hookway.
He demanded to know what was so commercially sensitive given that information about the budget was publicly available in the council's 2018/19 annual report.
Chief executive Shaun Clarke said the report was ''laden with commercial sensitivities''.
The budget had changed since the last annual plan and it was important that companies thinking of tendering for the project didn't know exactly how much had been budgeted.
''We'd be in a lot more trouble by releasing it than not. If anyone sees these numbers they'll tender right to the limit. We can't afford that to happen,'' he said.
The council looked at plans by the Whanganui District Council to build a new pound for $1m, far less than the quotes for the original Ngāwhā proposal.
Staff said, however, the Whanganui proposal was for mostly open kennels with a smaller building, no undercover vehicle storage and fewer exercise areas.
Construction of the new pound was supposed to start in February.