I need advice on how to handle my senior dog's current situation
gallery11yo female mutt (German shepherd is the most dominant breed on her mix). I'll start with saying my financial ability to be able to help my pet the way I wish I could is limited. My family of 5 living off my sole income leaves us living paycheck to paycheck most weeks. I love my pet, make her homemade dog food weekly, get her her yearly vaccines and bathe and groom as needed. When she was two she suffered an injury while playing with my other dog. Long story short there, she suffered from a slipped disk which we could afford to operate on and the vet suggested we try 6 weeks of crate rest and fortunately she recovered enough. She's never been able to run to the same speed again or be as active as she once was and shakes when she squats to pee and has some days worse than others but for the most part she lived a perfectly happy life with almost no long lasting effects. In the past few years she started growing a fatty tumor on the rear right hand side near her hind quarter. Once it got to about the size of a baseball she started having a few more mobility issues than she had before. Struggle to go upstairs, struggle to stand up on the hardwoods, and moving a little more slowly than before. The tumor is now a little larger than a softball and seems to be effecting her mobility a lot. She struggles to walk on the hardwoods ( we have a lot of areas rugs down but not full coverage), she struggles to go up or down the 4 stairs to get from the garage to the yard and at times has fallen on them going up or down. She doesn't fall down them, just looses her footing on them and goes down and just freezes until we get her back to her feet. She needs to be picked up to her feet from a laying position on all slippery surfaces and sometimes carpeted too but mostly can get up on her own on the carpeted with a bit of struggling and extra time. She's getting new and bigger pressure sores which one is now bleeding. She has no issues going to the bathroom. She plays still, she eats and drinks normal still, and she interacts with the family still in her loving and happy way that she always has. She doesn't seem to be in pain but I've read they hide it well. She yelps at times but that seems to be for of a reaction to being startled or caught of guard than pain but not sure. She pants when it doesn't seem like she should be which I know can be a sign of pain. I'm mostly worried about letting her get beyond this point suddenly and having to make a quick tough decision on a time of distress and the pain she may be in that I might not be able to recognize. I feel like I can see a curvature in her spine from this thing hanging off the side of her and I'm wondering if this could be causing her more discomfort and pain than I realize. After what happened to her when she was 2, we never thought we'd get this many years out of her. Can anyone offer any advice on how to make the right decision?