My daughter "rescued " a chihuahua female. She had it spayed and microchiped. About a year later, she develovped a tumer at the chip site. Vet removed the tumer as well as the imbedded chip inside the tumer, than put in another chip. Cost $1,200 A year later the dog had a new tumer . Daughter took the dog to another Vet. for surgery to remove the tumer as well as to remove the chip. Cost $ 1,278 . NO, she did NOT have another chip put in.