Keisha, they are open 24/7. You can call right now. Suzanne is correct in that they do not charge extra for anything that would be considered "after-hours" at another vet. I have found that they have amazing vets and techs at all hours.
When should i call
Their prices are more reasonable than most of the clinics in the area and from my experience they do not charge extra for night or weekend. I hope your pittie will be ok. If you are worried about price they might have alternatives as i remember seeing pamphlets about that sort of thing there. Call them and ask and schedule to go in. Good luck!
Keisha, please call the clinic.
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