Bulldogs coach Steve Folkes issued an ominous warning that the NRL premiership favourites had a lot of improvement left in them following their 38-6 thrashing of Wests Tigers at Campbelltown Stadium.

Their victory was highlighted by a hat-trick of tries to Kiwi Test centre Nigel Vagana and a brace to five-eighth Braith Anasta, who left the field in the 34th minute with a bruised sternum thanks to a stray knee from Ben Galea.

The match was effectively over as a contest by halftime as the Bulldogs racked up 28 unanswered points through tries to Anasta, second-rower Glen Hughes, Vagana and his fellow Kiwi centre Willie Talau.

"The last couple of weeks have been well below the standards we've set ourselves," said Folkes after his side's scrappy win over South Sydney and a narrow loss to New Zealand Warriors.

"Tonight was a hell of a lot better but we've still got a lot of improvement."

Anasta, who should be fit for Friday night's clash with Parramatta at Telstra Stadium, said the 'Dogs were close to the form they showed last season when they won 17 straight matches.

"I don't think we're too far off but we've still got a lot to improve on. We dropped off in the start of that second half," Anasta said.

"We wanted to make a goal that if we got on top this year we'd go on with it and finish sides off because last year we sort of let a few sides back in.

"We also made a goal that if we lost, not to lose two weeks in a row and make sure we win the next week. We achieved both those goals tonight."

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