Awhile back, I was offered a desireable model, low km car, that belonged to a neighbour, an elderly gentleman entering a nursing home. I snapped up the deal. The problem was he had a dog for many years that went with him everywhere he went with that car.
I tried every comnercial cleaning option tonget tge dog smell out of the vehicle without success. It was especially strong on hot, humid and rainy days, window ooen or not.

in the end, I sold the vehicle to a dog owning neighbour, who did not serm to notice the disgusting aroma - though I gave him a warning. He later told me it was tge best car deal he ever experienced (at tgevtime I took a sniff and the smell inside had not improved).