Help Drake Stay in His Loving Home

Help me save my boy! Hello all, as many of you know, I have a 3-year-old fur baby named Drake. He's the sweetest boy ever but has recently had some reactivity and behavioral issues. I adopted Drake from the FCAS a little over a year ago, and they weren't completely sure about his history. Upon adopting him, we were able to pick up on the fact that he was more than likely abused and didn't do well with other dogs. He's recently had issues at my apartment with his reactiveness and desperately needs training; otherwise, it could result in him being put down or me having to leave our home. Those who have met Drake know he's the biggest, sweetest baby, but he can be a handful and needs reinforcement.

With that being said, I have found a top-rated training program that I desperately need to register him for. The only issue is it costs $1500 upfront, and I need to pay $800 by Monday to secure his spot. I am currently in nursing school full-time and also working full-time to keep up my household, and I just simply can't fork out all of that on my own without neglecting any of my other responsibilities (school and other bills). I want to do whatever it takes to make sure me and Drake can both stay in our home and he can complete the necessary reinforcements to correct his behavior and be the best dog I know he can be. If you could help with anything at all, whether it be a donation or training tips and recommendations, PLEASE let me know. Thank you so much in advance!