My sympathies as a landlord who's had to remove those smells. They replaced the carpet. Did they replace the padding? In the past when I've had this problem, the smell also soaks into the sub floor and trim boards near peed areas.
A black light can illuminate dry dog and cat pee. You can hunt for problem spots, possibly roll back carpet in the worst offending areas. I know it can be hard to tell exactly where its coming from. Rest assured although it may seem like it, the smell doesn't come from walls and ceilings so focus on carpets and baseboards where a dog could pee. Also, one heavily soiled spot can make the whole house smell; this was the case with a tenants cat peeing in one corner of a bedroom. The entire house punched you in the face, but it was just one corner that needed cleaned up.
I've used this with great success - like, all uric smells completely gone. It has its OWN funky smell (like a chemical cleaner) that fades over time. But certainly better than uric acid smells. I had to use it on large areas of subfloor. Some of the soiled trim and baseboard just had to go.
https://www.amazon.com/Rocco-Roxie-Supply-Co-Professional/dp/B00CKFL93K
Sucks, because it shouldn't be your responsibility. Up to you whether you wanna fight them about it or move on, but maybe my post helps.
I know of this product from two of my friends and I see it has many great reviews so you might want to try it. Good luck :)