The reason no one responded to you is because you failed to mention what kind of animal you have.
Judging by the age of the animal and your picture I would assume it is a dog, which is what I am sure everyone else thought.
You needed to post in the dog portion, not the small pets portion. This is for gerbils and ferrets and the like. A dog, no matter the size, is still a dog.
However, if your dog is still alive and laying in her own piss, here are some ideas.
Sometimes senior female dogs will simply become incontinent, particularly if they have been spayed.
Also, a urinary tract infection could cause her to piss without realizing it.
In either case, the vet can help you.
If neither of these is the root cause, then your dog has simply become a lazy slob who prefers laying in her own piss puddle to getting off her ass and going outside.
Re-train her as if she were a puppy. Free run of the house is for good girls who piss outside, not bad girls who piss puddles and lay in them indoors.
Tether her to a human at all times. If she starts to piss, she is scolded and taken outside for a correct potty.
After her scolding, ignore her. Do not make eye contact or talk to her. She has to know you are mad at her.
One of the big mistakes people make is that they are too scared to punish their dogs. They punish and then feel guilty and give lovies right away, which tells the dog that their screw-up was perfectly fine.
If she is not tethered to a human, she is crated. Most dogs will cross their legs and turn blue before pissing their crates.
If you don’t want to spend the rest of this dog’s life with her tethered to you, diaper her.
Dog diapers are expensive and don’t always stay on. We used a child’s swimmy diaper and cut a tail hole out. Be sure the tail hole is very snug or if she decides to take a dump the crap will fall right out of the diaper.
When she pisses the diaper, LEAVE IT ON HER. Leave it, leave it, leave it so she knows the misery of walking around in a wet diaper.
If you rush to change her she will be comfortable and continue to piss her diaper. The goal is to make her so miserable that she’ll hold it until her bladder bursts before pissing the diaper again.
We had a dog we had to diaper and after he wet his very first diaper he cried to go outside for potty.
After awhile we just had to show him his diaper to keep him on the straight and narrow. We’d pull it out every week and tell him this is what bad boys get and he’d cry at the sight of it.
That was THE END of that little SOB pissing inside.