Who feeds the animals at Petsmart on holidays. like Christmas. when they're closed?

Santa. Unless they're Jewish. Next week it'll be the Easter Bunny. But he never feeds the snakes.

Petsmart does not have its own animals the animals are brought in by rescue groups or local shelters. For limited period of time those animals are taken by the shelters or the rescue groups back to where they normally are they do not live at Petsmart. If you ever look at the names of the animals you will see the organization that has brought it in usually they're there for a several days with a member of the organization or the staff. Petsmart also rotates his organizations for example you may see a different set of cats on a Different Weekend Because they are sponsored by a different organization.

As far as the smaller animals such as fish and rodents they do have someone comes in and brings the food in usually someone from the veterinary clinic or manager.

They may have someone come in to feed all the animals. Some may just give extra food and water to last the day.

the pet stores are only closed on specific holidays like x mas or easter,a nd thats only for a day. they just fill up lots of food and water and leave them for the day, theyll be fine

You're such a great person for worrying about this as it might not even cross others' minds. :)