Thomas and a foster cat I had, Sammy, are buried at my parents' house, along with my sister's cat, Taco, and a whole host of pets from our childhood (our cat, 27 gerbils, 4 mice, a hedgehog, a turtle, a rabbit, newts, fish...).
When Sadie and Riley pass, I will have them cremated and spread their ashes at one of our favorite hiking spots (if we've moved at that point, then it'll be our new favorite hiking spot, I guess, or maybe I'll bring them back here). When Bevo passes (cat), he'll be buried at my parents' if I'm still living in Texas. If not, I guess I'll have him cremated as well and probably bring the ashes to my parents' at some point to bury. I don't know.