[Ollie's Folks]

We just got our 6 month old puppy back today after being spayed yesterday. She keeps trying to pee, but nothing is coming out. When we take her outside, she keeps squatting like she needs to pee until we bring her back in. Does anyone know what's causing this? Our vet was closed by the time we noticed she was doing this and they don't open until 8 a.m. It could be a long night for all of us.