Animals and Osteoporosis
Animals are not recognized as getting osteoporosis. This may be because nobody is looking. Animals are not routinely scanned for bone density the way older people are.
Horses are recognized as getting osteopenia, but not osteoporosis. Some veterinarians have claimed to have found enough loss of bone mass in the coffin bone of old horses' feet to merit the designation of osteoporosis.
Generalized osteoporosis appears to be rare in horses, but localized osteoporosis appears more common, especially in limbs that are not used.
Dogs (especially) and cats get arthritis, but they do not get osteoporosis.
You might see some websites claiming dogs get osteoporosis, but this is
not widely accepted among veterinarians. Again, it may be that pets are
not examined as closely as humans, especially for outwardly invisible diseases
like osteoporosis.