uti?

For the past 2 days now, Runner has been peeing inside. She goes to the door often. Any home remedies or stuff at pet store to treat this? Or shall I go to vet?
eta.. when she goes to be let out, all she does is sniff the air and come back in.

With this change in behavior, I would run her by the vet.

At;east I think it's her lol. I don't see anyone doing it and it smells like dog pee. She doesn't seem to be straining. How could I tell if she was straining?

If it has a odor, its probably a mild infection, but she needs antibiotics. Especially if its dark.

I don't smell an odd oder. Nor is it colored. It's on the carpet an I found it by stepping on it.

If it were me, and Logan suddenly changed her pee habits, I'd haul her to the vet. Best to nip any infection in the bud because it gets very painful (I should know from human experience.. :(

Is it cold outside? I know many dogs that would rather die than pee outside when it's cold or snowing.

Solo had a mild pee issue not too long ago. I managed to clear it up in two days by giving him a cup of Bolthouse Farms Cranberry Lemonade a day, along with his usual fresh parsley.

Could it be behavioral. We do have a new kitty.

Could be- but you need to rule out its not medical first.. then we can go from there.