CarolC, I first want to say that you are an angel and all of your information and replies on this and the other ANNPE posts got us through the incredibly hard first few weeks of our girl Lilly's recovery journey for an ANNPE that happened to her on 11/19/24.

Lilly had a very severe ANNPE while running after her ball in the yard. She is a very active medium sized dog (supermutt but definitely some herding dog in her). She lost complete use of both of her legs immediately, though the vet confirmed she did have deep pain sensation in both feet. We were very lucky to have a great emergency pet hospital near us and they were able to do an MRI on the same day to rule out a ruptured disc but they said her ANNPE was very severe and they really weren't sure if she would be able to walk again and told us either way it would be a very long road ahead. They told us the first 90 days are super important to put in the work with her doing PT and other treatments to set her up for as much success as possible.
We were devastated but tried to do as much research as we could (mostly getting answers from this amazing forum) and tried to be grateful that she was even alive. (Apparently in rare cases a dog's spine can "die" for lack of a better explanation after something like this—they said once you are two weeks out without regressing that's no longer a concern.) We had to keep her very still for the first two weeks but they had us doing some basic massage and PT to try and make sure she wasn't in too much pain and to help stretch out her muscles since she couldn't move her back half at all on her own.
We were told to limit her activity at home for 4 to 6 weeks so we mainly kept her in a large playpen. The main concern was they didn't want her dragging herself around the house because she could get hurt, plus they didn't want that to become her norm and for her to become unmotivated to walk again. They told us early positive signs were that she could support her weight on her back legs, attempting to walk, responding to being touched, and tail wags. The only negative signs to look out for were if she seemed to be getting worse (not counting an occasional off day) or if she seemed to be in any pain. They did also tell us that this is a freak accident and it is very unlikely something like this might happen to her again. As she did more PT and got stronger, her left leg would do a weird vibrating/bouncing motion (not a shake) but they said that was normal. I was being an overprotective dog mom and constantly tried to move her out of positions that looked uncomfortable but the vet said if she was hurting she would cry out or shift herself and that we could mostly let her do her own thing regarding sleeping positions.
I know this has been said in this forum already but the first few weeks are brutal, BUT you will get a system down and figure out the easiest and best way for you and your pupper to do things, you will make progress, even if it's slow, and it won't always feel hopeless. You will get so excited about the smallest wins. My husband and I were lucky to have each other to help out with all of the new demands on our time and energy. If you're helping your puppy recover solo if you can have a friend help you with doing their physical therapy or giving them a bath it makes a huge difference, but everything your furbaby needs can be done solo too.
At the two week point, we met with a vet physical therapist and got Lilly started with some acupuncture, laser therapy, and estim therapy. They also had us start doing real PT with her. Three times a day we would have her do sit-to-stands where we would support her and help her sit stand up, tickling her hamstrings as needed since that was some sort of reflex to help her muscles want to stand, and then have her sit down and we would repeat that three times. At first we were shocked that she was even able to attempt to do the exercises because she had barely moved at home, especially since we were trying to keep her still to heal. The vet told us she was concerned at Lilly's lack of concern about her back legs and we needed to really get her motivated to get back as much functionality as we could. We had asked about getting her a wheelchair so she could move about freely and to make it easier to take her out to potty but the vet discouraged that and said we needed Lilly to work at these things to stay motivated and not give up on using her legs (mainly, don't make things super easy for her).
Lilly had been put on gabapentin and trazodone, and trazodone makes her super hungry so she was very treat motivated and she started trying really hard to earn her treats during PT. (As an aside, they put her on steroids as well which can make the pee accidents happen a lot more frequently so if your baby is having a lot of accidents and was on IV fluids and/or steroids there is likely some light at the end of that tunnel.) She would slowly start doing things like moving her paws in her sleep, slapping her tail in her sleep, moving her paws when we tickled them, and other things like that that gave us hope. The vet said these were just reflexes but took it as a good sign that her body was able to move her feet and tail at all so we tried to keep being positive. Lilly slowly started to get a tiny bit stronger each day. Her right leg started coming back way faster than her left leg.
We really started to see her improvement happening faster when she was able to do the water treadmill at PT at 4 weeks after the initial accident. She needed a lot of assistance but we think having her be able to do a walking motion in the water was super helpful for her muscle strength, muscle memory, and to put an end to the knuckling. We also think the estim has been a huge help. (It basically exercises her leg muscles for her while she lays there and looks cute.) We were slowly given more exercises to do with her as she got stronger and her balance got better. She does side steps, steps over little bars, takes backward steps, goes around cones, steps up onto and off of a step, etc.
For a timeline (which I was desperate for but of course all dogs will heal differently): Her right foot stopped regularly knuckling around 3 weeks and her left foot finally caught up around 6 weeks and all knuckling stopped by 13 weeks. She started to be able to stand and stay standing (ugly and leaning on her stronger right leg) at about 5 weeks. Her tail started wagging at 6 weeks, but only when she's really excited and it's still that way. She also started to cross her legs less and sometimes correct the crossing around 6 weeks. She stopped falling down while doing a body shake around 7 weeks. She could do a clumsy walk on her own at around 10 weeks. With lots of physical therapy and estim we have gotten her strong enough at 14 weeks to take short walks with a sock on to protect her left foot which still occasionally drags. She is even hopping up onto the couch (mostly with success) and can easily jump off of it now, do a weird little hop and then balance herself out. She is also able to run and gallop around the yard quite well sometimes but it's definitely wonky. She still only has proprioception (basically the signals from her brain to her legs/feet) in her right leg but her left leg is doing really well on muscle memory alone. They said it is unlikely it will come back but there is always a chance, even years later, that it might "come back online."
I do want to mention that she had a ton of accidents in the first few weeks after it happened but after about a month I think her peeing was totally under control (we still occasionally have to press on her bladder to make sure she is going regularly) and she can now do a very low squat and pee by herself. Needing to poo seems to make her legs a little bit weaker so we still give her support for that (via her harness) and she has learned to do a little walking poo situation which works about half the time for her. She does still have accidents in the house when she gets super excited and is bouncing around.
Lilly hates car rides so the car stress started to outweigh driving her to the rehab place for her PT so we now have someone coming to our home to work with her occasionally. The new PT person pointed out that we should also be massaging and stretching Lilly's front legs since they are bearing so much more weight and strain than they used to (especially when she really couldn't use her back legs at all). We hadn't thought about that so this was a great tip and we can tell Lilly loves the massage on her front legs. We had been doing it on her back legs only for months.
Some things that helped us a lot: If you can afford it, I would recommend the help em up harness. I was resistant to it due to the cost but it instantly made bathroom breaks, home PT, and helping to support her so much easier. We had been using a makeshift harness from the vet that was not great. I would also buy an estim machine for the home as well. It's not too expensive and we think it helped Lilly out a ton. We also liked these socks for her:
https://www.amazon.com/dp/B088FJXSVG?re ... title&th=1. I sewed them on the sides so they would fit her skinnier paws but the grip is good on them and the velcro band helps them stay on. The hard booties did not work for us. We also bought a ton of runners and put them down everywhere so that she would have traction throughout the house. Lastly, we kept pee pads, dog poo bags, and baby wipes in different areas of the house so that we always had them nearby if she had an accident.
I took a lot of videos of us training her and her progress and they are all in a google photo album so if you would like to have access to that feel free to send me a private message.
I also want to mention that while the vet, and especially the workers who actually did the PT with Lilly, were super helpful and a huge reason why our girl can walk today, they were very cautious about getting our hopes up and didn't always celebrate the wins as hard as we did. And there were days that we took her in when she was having an off day and they couldn't see the progress she had been making. I wanted to mention that so you don't lose hope if you're seeing good signs at home but not getting a ton of positive confirmation back.
We are so proud of her progress. We truly thought it would be a year or more for her to even come close to what she's able to do now. And we truly weren't sure she would ever be able to get around without assistance of some sort. I wanted to share our story to give others hope, especially those with furbabies that have severe ANNPE and whose abilities don't come back within the first few weeks or months. There is always hope!