A series of alternating growth and muscle growth drawings by cooner drawn over two years for toastedwheat featuring their anthro Arctic fox character Toasty Toast.
The story is titled The Risks of Self-Experimentation for the first 22 parts. It's renamed The Rewards of Self-Experimentation on part 23.
An Arctic fox drinks a mysterious substance from a test tube which causes him to grow muscle and in size, although it alternates between primarily one or the other.