What are my chances of getting full custody if I originally let my ex have joint custody

Your issue is not with custody, nor joint custody.  This issue is with the on-going visitation and its impact upon you, the child and your relationship with the child.  Where you to secure a "full custody order," there would still be visitation with the ex-spouse.  In fact, the joint parenting may be to your advantage.  Read it closely.  There should be provisions detailing the conduct of each parent, especially in the presence of the child.  Additionally, there may be provisions for mediation.  This is where you can raise an issue - such as the language choices and exhibitions of violence towards the dog - and ask to mediate these issues.  Mediators are trained in such matters, look for areas of compromise, and can assist is finding acceptable non-judicial resolutions.  This may be an option that you would look to explore. You may also wish to consult with an attorney to determine what is considered acceptable conduct to address for change in mediation.  For example, the matter could be seen as an internal pet issue even though the dog is, per you, being abused.  It may also be that an abusive environment is perceived to exist that improper teaches a child how to respond violently to issues of annoyance in life.  An attorney with experience in mediation and visitation matters in your county can help you to assess the best means to address this situation, not only for yourself, but your child. If you were satisfied with the attorney that handled the divorce, a return appointment may be in order.  This attorney would have the familiarity with your ex-husband.  You may also look for an attorney with more of a specialty in post-decree and/or mediation matters.  A quick search of the internet or a call to your county bar association should provide you with the names of such attorneys.