She was responding to Unite leader Len McCluskey's suggestion that winning 200 seats - almost 30 fewer than in 2015 - would be a "successful" result for Mr Corbyn - comments he later claimed were taken out of context.
Ms Dugdale, the party's leader in Scotland, said she defined success as "winning the election".
"The Labour Party campaign has outshone the Tories' comfortably". I'm full optimism for what Labour can achieve'.
Corbyn also said there would be around £49 billion in annual spending for key services, which would be paid for by increasing tax on high earners and corporations, if Labour is elected in June.
"I think there's a rumbling, a subterranean rumbling at the moment, where people are saying we want change".
The Tories said that if Labour's nationalisation programme - which was not costed in the manifesto - and other investment spending was taken into account, it would lead to an additional £58 billion in borrowing by 2021-22, the final year of the next parliament.
The £100 savings on water bills would come from stopping the extraction of dividends to shareholders, which have averaged £1.8bn per year during the last 10 years, and reducing interest payments on water company debt by £500m per year.More news: Spurs Fan Files Lawsuit Against Pachulia, Warriors For Leonard Injury
More news: HYS: Will Conte be sacked next season?
More news: Storms pummel central USA , as tornadoes kill at least 2
Labour will also act immediately to end what Corbyn refers to as the worst excess of conservative government changes to welfare including scrapping the bedroom tax.
Ms Dugdale was speaking ahead of a major campaign speech in Glasgow, where she will appeal to voters in Scotland who backed remaining in the European Union and the UK. In three weeks, the Scottish Labour candidate on the ballot paper is the option to reject the extremes of both the SNP and the Tories.
Scottish Labour believes that together we're stronger.
"Our country will only work for the many not the few if opportunity is in the hands of the many".
"Who just want us to be getting on with the job of governing and changing people's lives".
"But our votes are being hijacked by Tory and SNP politicians who want to use how we voted in referendums and general elections to assume something about the kind of future we want to see".
"You can vote for a Scotland where we put the real issues of our jobs, our economy and our public services first".