I think to be on the safe side, I'd ask the shelter, or vet which brand of microchip is being used. Most vets & shelters have scanners to read "Avid" and "Home Again" chips, but most don't have scanners for other brands coming out on the market. Best to have a backup of tags and collars, but even then there's really no guarantees that the collar won't come off, or even be taken off.