Do you have to call ahead if you want your pet to be seen?or are walk-ins allowed?

You should call ahead--but they usually can accomodate a 24-48 hour turnaround time to be seen.

Usually can get a same day appointment

I usually make an appointment

Probably best for an appointment they are not very large !

It depends on the service. Usually if you only need a veterinary technician (nail clipping, etc) you can walk in. Otherwise it's best to make an appointment.