The present invention relates to a veterinary composition for the prophylaxis and treatment of mastitis in mammals. More particularly, the present invention relates to the treatment of mastitis in cows. The formulations of the present invention comprise two parts which are generally administered to the animal as two separate formulations. The first part is a seal formulation comprising a gel base and a nontoxic heavy metal salt in the base. The second part of the formulation is the oil based product which may for instance comprise an antibiotic in an oil-based formulation. The oil-based formulation may however contain any pharmaceutically active agent for the treatment or prophylaxis of disease in cattle.
