A number of undisclosed digital agencies pitched for the business last week.
Pedigree is expected to decide on a new agency at the end of this week.
The digital account spans ?e-commerce, retail work, strategy, advertising, digital content and social networking.
The pet brand is expected to target the millions of pet-lovers who buy products online or form part of web-based communities.
There is no retained incumbent agency on the business - previous digital work was handled on a project basis by a variety of agencies.
JoshuaG2 handles below-the-line work for Pedigree, while TBWA\London oversees the company's above-the-line business.
Neither agency is involved in the digital pitch.
Media planning and buying is handled by ZenithOptimedia, which is also unaffected by the digital review.
A Mars spokesman said: "We are unable to comment on this matter at present."
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