Maddy is on her 2nd really bad UTI since february and is being treated for incontence so I would like to start her on cranberry pills to try and help some. What I am asking is what dose do I give her? I was looking at the health food store and they have all kinds of strengths(mg) and I didn't know how much to give her. She is a lab mix and weighs between 45-49lbs. Thanks for any help.