One of the officials was injured after he was bitten by the dog, according to official sources.
An FIR has also been registered against the director concerned for letting the dogs on the excise officials and hampering their work, they added.
Acting on an intelligence input, a team of Directorate General of Central Excise Intelligence (DGCEI) here conducted searches in the official and residential premises of directors of M/s Trikoot Iron and Steel Casting Ltd, Muzaffarnagar.
The officials carried out search operations in the factory, head office and residence of directors of the firm early this month, the sources said.
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Several incriminating documents, pen-drives, hard disc containing incriminating data were recovered during the course of the search proceedings.
The sleuths faced severe resistance at some of the places during the course of search. Prima facie, the excise duty evasion is at least Rs 20 crore, the sources said.
According to DGCEI sources, the officers were attacked by two dogs during the searches at the residence of one of the directors of the company.
Later, the situation was brought under the control with the help of additional police force and the hard disc was recovered after a thorough search. But an officer of the DGCEI was bitten by the dog, they said.
The sleuths also found a secret office being operated from a kitchen of the director's residence.
The company was allegedly found to be evading excise duty by showing less sales and through other fraudulent means. The data was also being stored in computers installed in secret office being operated from kitchen and other rooms of the director's residence, the sources said.
The tax officials were also able to retrieve data from the hard discs of these computers which were well secured and password protected.
The officers also recovered other incriminating documents from the residential and other premises. The company made sales of 'saria' (rods) to the tune of Rs 100 crore during the last three months but showed sales of Rs 35 crore on papers, the sources claimed.
The director of the company has admitted to tax liability and deposited Rs one crore on the spot, they said, adding that the further investigation in the case was continuing.