Featured on a pair of pink high heeled shoes, the fur had been advertised as fake.
Animal rights campaigners Humane Society International (HSI) and Sky News discovered the fur, after a tip-off from a concerned customer.
Missguided says it has a strict no fur policy and removed them from sale after being informed of the findings.
They are now planning on launching an internal investigation with suppliers.
The European Union bans the sale of cat and dog fur.