really sad to hear that... but 10 years is quite old for a dog since their 10 years = human 70 years. I heard some old ppl say if you really want you doggie become a doggie next life than have to throw into river or ocean, If you hope your doggie have good second life, than what you have to do is to pray them like the way we pray for our ancestors. Example, we can build a animal grave for your doggie and must pray them instead of setup a grave and abandon them. Like that better don setup. Nowadays, some pet shop even offer cremation for ur pets so you can get them with you always and protect you like our ancestors. Last time i do have a dog we died few years ago and we do not setup a grave or what for her just simply buried them at the back of my house. In the end the dog second life still become another dog. (don ask me how i know this) I know my words is ridiculus and funny if you are non buddist, but just my 2 cent. You can also follow western ppl who like to tatto using their pet.