Your old dog sleeps through the doorbell. Your senior cat walks past the treat bag without a twitch, or bumps the same chair she has dodged for ten years. It is easy to read this as "being stubborn" or "just getting old". Often it is neither: the world is getting quieter or blurrier, and your pet is doing their best with what they have.
The good news is that most pets adapt well once their people change a few habits. The first step is a vet visit, though, because not every change is "just age".
Signs of hearing loss include not reacting when you call, sleeping more deeply than usual and being startled by a touch. Signs of sight loss include bumping into furniture, hesitating before jumps or stairs, avoiding dark rooms and eyes that look cloudy. Some pets hide it so well that you only notice when the furniture moves.
Book a check-up for any of these. Vets and welfare groups such as the RSPCA stress that sight loss shouldn't be written off as age, because some causes can be treated and some signal another illness. If your pet suddenly seems blind or deaf, or has a head tilt, a swollen or sore eye, ear pain, or seems confused, call your vet the same day. We can't tell you what is going on with your pet; only an exam can.
Everything you do all day relies on a sense: calling, waking, walking, playing. Pick your pet and the sense that is fading, then tap a moment to see what to swap in.
Pets with poor sight build a map in their heads from smell, sound and touch. Your job is to keep that map reliable. Keep furniture where it is, keep the bowls and bed in the same place, and make landmarks: a rug here, a mat there, a radio playing in the same spot when you go out. If you need to rearrange, walk your pet through the new layout slowly and reward them for finding things.
A word of caution about scents. Some blind-pet tips suggest scent markers around the home, but many essential oils and liquid potpourri are poisonous to cats, and some are risky for dogs too. Stick to textures and sounds, and ask your vet before using any scented product near your pet.
Many very old pets lose a bit of both. Then touch, smell and routine matter more than ever. Keep their days predictable, approach slowly and in plain sight, and always let them sniff your hand before you touch them. Go for gentle, short sessions of games and training using scent and treats.
Change the signal, not the relationship. A treat after every new cue tells your pet: this is still a good world.