Duchenne Muscular Dystrophy is one of the most severe forms of MD. This is what Petey suffers from. Here are some resources that helped me better understand this disease.

Parent Project (DMD and it’s progression)

Health Line

Both of these sites give great information on what it is and how it progresses. Please take some time to familiarize yourself with this disease. I will warn you that it can be very upsetting and difficult to learn some of the details. Thanks again! Also include any other resources that you’ve found to be helpful as a comment.

Duchenne Muscular Dystrophy
DMD, Duchenne Muscular Dystrophy, resources