This depends on the dog and the amount of time it takes for them to be adopted (puppies tend to get adopted faster than adults, but it varies). It is also dependent on the time a foster can dedicate to the animals in our care. We understand when they have plans and other commitments! If you would like to foster a pet with medical needs, their time in foster can depend on their recovery time from various procedures etc. When it comes to nursing litters, they will need a foster until they are weaned and at least 8 weeks old.