I have at least 30 animals buried in my back garden. Mostly guinea pigs as well as 5 hamsters, 7 rabbits and 1 dog. They're not all my companions. I brought home at least 10 from the rescue to bury as they were unable to dispose of the bodies in an adequate way. I've ran out of space so have started to use the front garden as well but that is difficult to dig. I'm wondering how long it takes for the remains to completely decompose. Do the bones ever just become dust or will they still be in the ground? I'm sorry to have to talk about this, its not pleasant I know. What I need to ask is, if I start digging where animals were buried 4-6 years ago will there still be any visible remains?