It's interesting what we as pet owners can do these days! Yes, there are many pet cemetaries nationwide, and lots of cremation services available for grieving owners.
The veterinary hospital where I worked last year used these services for clients who wanted the remains back after a euthanasia. We outsourced the cremation services to a local animal memorial organization, and they did a wonderful job on the urns!

Not that I want to think about it right now, but I know that when the time comes for my animals, I will probably get urns for them or have them buried in a memorial pet cemetary.