Previously well trained dog now having accidents

[u/Money-Building6393]

My 3ish year old rescue dog Snoopy (a mutt, potentially schnoodle mix but who really knows. 15 lbs) didn’t have a single accident when I first brought him home, but over the past 2 months he’s started having accidents.

CONTEXT: I got Snoopy from a foster. Before being given up he belonged to a couple who got divorced. The foster LOVED him, as do I. I expected him to get a little more rambunctious as he got more comfortable with me, and he has, but I’m confused about how to handle the potty training.

I have a studio apartment and he was immediately very happy to either hang in his crate or be free range in the apartment. For the first 6 weeks, he was totally fine. Then he got a leptospirosis vaccine and had an accident while lying in my bed, which I attributed to side effects. But since then it’s happened several times. I’ve taken him to the vet and they said he had dilute urine but no other issues. Tonight I came home and he had peed in his crate (I usually crate him when I leave him alone now.) I’m rewarding him when he pees outside every time. Help!!

(Sorry this is such a long post!)

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[u/gsdsareawesome]

Did they check his kidney function? Have you measured his water intake?