Our 3 year old bitch was mated 3 weeks ago today and I'm getting a bit concerned about her. Just recently she's started drinking and weeing a lot more than normal. We don't know yet if she is pregnant but I'm just a concerned - is this normal for just 3 weeks?
I would get her checked in at the vets urgently. Could be a relatively harmless cystitis, or a pyometria, which needs urgent attention, or nothing at all to worry about.