Frequency of treatments will depend on your pet’s type of cancer, their overall health, the specific drug, and of course, your family’s wishes.  Most dog and cat chemotherapy treatments are given in intervals ranging from once a week to once every three weeks.
The duration of the treatment is also dependent on the type of cancer your pet has, and can last from a few months to a few years.
For lymphoma, most standard chemotherapy protocols last between 16 and 24 weeks.