Proin is a chewable tablet prescribed by your veterinarian to treat and manage urinary incontinence in dogs. With all the same efficacy as Proin Extended-Release Flavored Tablets, these tablets work by helping to tighten the bladder and urethral muscles to prevent urine leaking and accidents. And since they come in a tablet form, you can feed them to your pet by mouth or disguise them inside a tasty pill pocket.