World Vision, which aims to tackle poverty and create sustainable development in some of the world's poorest regions, currently has a gift scheme in which donors can offer a goat as a present to a community in Africa or Asia on someone else's behalf through an online ordering service.
The organisation said Oomph's "technical expertise and overall creativity" were among the reasons why it was chosen to work on its brand communications and donor recruitment.
Rodger Williams, creative partner at Oomph, said: "If we can link the giving of a goat to the great things that World Vision do around the world, it will be a worthwhile and fascinating creative project."
Oomph, which is part of the Cello Group and specialises in multichannel ad campaigns, has clients across the retail, charity, travel and financial services sectors, including John Lewis, Help The Aged and Budget Insurance.