Well that blows , sorry to hear . You can’t replace them but I’m sure when it’s time another will come along for you to guide thru life and help guide you . I never look for a replacement, they find us , in the parking lot at work , at the parking lot at the Misses job , on a job site . All my furry friends have be “curb shopped” over the last 30 years at the right time when we needed each other