Dog drinking and peeing more than usual
Hello guys.
My dog is going to turn 6yo in October. Male, not spayed, 20kg.
About two weeks ago I started to notice him drinking more than usual. He always drank a lot but it seemed more than usual. And this last week he couldn't really stay all night without needing to go outside. I woke up 3 times in the middle of night (about 3 to 4 hours before he went outside) and he was leaking from his penis. He doesn't really pee voluntarily on bed but he was leaking and I went with him outside and he pees for almost a minute.
Usually his pees are 20 seconds during the day.
He seems completely normal otherwise.
I notice he drinks much more water from late evening and night, not really during the day.
Wednesday I talked to the vet and they told me they needed a urine sample, I took the sample around 12pm and gave them.
Yesterday I went there with him because they asked me to and the vet told me they found his urine was very diluted for what he has been drinking (1.5L/day). Since then they made uroculture and bloodwork. The vet told me his bloodwork was perfectly fine and it didn't seem to be adrenal either but she wants ultrasound/ecography so she can see kidneys and adrenals and liver and everything.
These last 24 hours he drank more likely 2L than 1.5L. He still seems completely fine other than that.
But the ultrasound will be only Tuesday morning.
She told me she needs to really discard kidney disease and adrenals or tumors. She also said it could be diabetes insipidus. But I saw online that if it was that it would need to be much more water. Or can it start like this?
Also, could it be something infectious like leptospirosis or this behavior and time doesn't align with it?
I'm just really stressed. What do you guys think it could be since his lab work seems to be fine except for diluted urine?
Thank you.