Ok I ll tell you the story from the beginning. I found Lucky when he was an older puppy – on the street, he was a stray dog. He was lying injured who knows how long, obviously hit by a car. I took him to myself and brought him to a vet (to a vet in bosnia who does all the ortho surgeries). He told me his hip is misplaced and that he has to do an fho surgery (Lucky was around 4-5 months old at the time). Surgery went ok and Lucky uses his leg (not perfectly, but acceptable). He has grown in the meantime from 35-40cm of height to 60cm of height, the shortnes in the leg with operated hip was obvious, and he was somehow rotating it while walking. I knew he will need an fho surgery on his other hip very soon as well. In the meantime he jumped awkwardly and injured his crucial ligament and he developed an obvious patella luxation (I had to put it back by myself every time his patella popped because he just froze and got very frightened), I brought him to the same vet again. He examined him by hands (he hasnt done an x ray) and told me that Lucky needs a patella surgery immediately, so I agreed. He is now 5 weeks from patella surgery,. We went to the same vet the other day for control checkup, even though he limps on his patella-fixed leg, the vet says its ok, it will be better after some time, and the vet has done his “healthy” hip x ray. Thats when he told me that Lucky definitely needs an fho surgery on his “healthy” hip as well, that he has very low density bones and that I have to take extra care of him because they might break easily. I asked are there some solutions to it, can I improve it with calcium supplements or something (I already give him glucosamine and omega 3) and thats when the vet said he had the same situation before with some other dog and he tried with supplements -vit D, calc and phosphor but it didnt help, it only made it worse (weird). The same vet told me Lucky has patella luxation grad 1 on his other knee as well, but no ruptured ligament and that I have to take him to that surgery as soon as possible, that I shouldnt wait until it ruptures.. So Lucky apparently needs another 2 surgeries and he has that weird issues with his bones. At the moment I have nowhere else to go (except maybe outside the country, but Im afraid it would be all much more expensive, even this here I can hardly afford. Lucky mostly eats liver and rice, sometimes canned red meat or fish very very rare kibble (he is not a fan). I also give him yogurt and cottage cheese. I wouldnt say its a bad diet.. I dont give him bread and other carbs except rice. Im sorry for the long message, but I could really use every advice possible Thank you both for responding, Im afraid I dont have much options, here in Bosnia when dogs have a lot of health issues, poeple mostly euthanise the dog 🙁 but that is not an option, Lucky is my whole heart.
Thank you both so much!

Now she is completely fine :/

There is also a big possibility he lies on his “fixed” side because he had an fho surgery 2 years ago on his other hip which he still saves, for example – while walking downstairs..I mean before surgery

Thank you Krista very much for your reply, but could it be infection if he is still on his post op antibiotics (amoxicillin+clavulanic acid)?