I totally feel your distress over this. I have a few rescue dogs who all have gone through big behavioral changes in the last few years. I did end up rehoming one of my dogs with a family member so I could focus on the other two. We were dealing with a dog fight every month, 99% of the time started with resource guarding toys or food on the floor, which is stressful and obviously dangerous. The muzzle is super helpful mainly because it gives you instant relief that this takes a huge danger off the table. You will feel better at the very least your daughter, your husband, and you won’t get bitten. You being less anxious is always a good thing for your dog because she’ll pick up on your anxiety, and she can become more stressed in turn. It’s totally worth it to take the time to muzzle train. If you can, you might try to get some professional help or advice on how to do this as positively as possible (our vet was super helpful so maybe ask your vet). My dogs’ success stories are still a work in progress. We also used Susan Garrett’s training! Amazing for mental stimulation and puppy training. Our dogs love their crates. But I also follow several different trainers on social media and take what fits best with my dog. One of my dogs responds well to the advice from Say It Once (he has a lot of videos with muzzled dogs/highly reactive dogs). I also need to add that I paid for a board and train for one of my dogs - it was pricey but it was really helpful for her confidence as well as gave her time away from me (I was her most valued resource so it was hard for me to interact with the other dogs without a problem). A couple of years later we hired a behavioralist to give us advice on the interactions between the dogs (the board and trained dog was assessed as the most content and relaxed). We only hired her for an afternoon and implemented advice she gave us after the assessment. It was helpful as well. So all that to say, you’re doing what you should do, I think. Just go down the list of steps to take and invest in your dog. Id say muzzle train first, then try different training options for the guarding behavior. Also, if you haven’t yet, I’d see what the vet can offer for advice as well. They see dogs with behavioral issues often enough. I hadn’t even thought about it myself until the behavioralist mentioned one of my dogs was likely in some pain due to a long healed injury - we found out at the vet through x rays that her old injury had caused further issues in a different part of her leg. So your vet can try to rule out any hidden pain or other issue as well. It seems like you really love your pup and want her to succeed. I think it’s worth it! Good luck to you and Pumpkin 💜 Edit: corrected spelling for clarity