Your dog stops at the edge of the kitchen tiles. Or freezes at a drain cover on the pavement, and will not be talked across it.
Three things look identical from where you are standing. A body that hurts, a normal wariness that has landed on a surface, and a dog who is not sure where their back feet are.
Pain first, if this is new
Pain frequently presents as a change in behaviour rather than as obvious lameness. Refusing a floor your dog used to cross without thinking is a common version of that.
Bodies at this age are also still developing, which is its own reason to get a sudden refusal checked rather than trained. A dog who gained height in 6 weeks is still learning to drive it.
It appeared over days rather than weeks, or straight after one slide.
Your dog is slower to get up after resting, or shifts weight off one leg.
They cross carpet at speed but splay out on tile, or their back end slides sideways.
They lick at one joint, flinch when handled near a hip or shoulder, or have stopped jumping onto the sofa.
They are a large or giant breed between roughly 6 and 18 months old.
Safety note
Book a veterinary examination before any confidence work if any of the points above apply. Sudden behaviour change warrants an examination, and pain frequently presents as a change in behaviour rather than as obvious lameness. Get help now if your dog cries out, will not put weight on a leg, drags a foot, goes stiff, or growls when handled. That is a veterinary question and not a training one. Ask about nail length and the hair between the pads at the same appointment, because both affect how a foot meets the floor.
If your veterinarian finds nothing physical
Then this is confidence, and confidence is trainable. New wariness of ordinary things is common in the second half of the first year. Owners and trainers commonly describe it as a second fear period.
A slippery floor is a strong candidate for it. It moves under a paw, it is loud, it offers nothing to grip, and one slide is usually enough.
Grates and drain covers add a second thing on top. Gaps you can see through, air moving underneath, and a surface that rings when a claw lands on it.
Change the floor before you train the dog
Lay a path. Runners, yoga mats, bath mats or cheap rugs from the door to the water bowl, so no journey needs bare tile.
Keep the route your dog uses most covered for 2 weeks. Every failed attempt rehearses the fear rather than solving it.
Feed, sleep and greet on the non-slip side. Your dog should not have to negotiate the floor 8 times a day in order to live there.
Outdoors, curve around grates rather than over them. Turning early is the plan, not avoidance.
Then 3 minutes a day, one paw at a time
Working below the point at which your dog stops coping is the condition for learning near something frightening. On a floor that usually means one paw at the edge, not a crossing.
Sit on the floor at the edge of the surface with 15 treats. Feed for standing on the safe side doing nothing, for 2 days.
Then put 1 treat on the very edge of the slippery part. Let your dog choose to lean in and take it. Feed again there, then stop for the day.
Move the treat 6 inches further in every 2 days, and only once the last distance is easy and unhurried.
Leave a 2 inch gap of bare floor between two mats, then widen it slowly. A gap is a much smaller ask than an open room.
If your dog stops taking food, you have gone too far. Go back to where it was easy and finish there rather than on the hard rep.
Confidence and relaxation are trained as behaviours in their own right, in short repeatable sets below your dog's threshold. Three minutes is a session. Ten minutes of coaxing is not.
What not to do
Do not carry your dog across. That teaches them the floor is something to be rescued from.
Do not pull on the lead or the collar to get them over a grate. Forcing a frightened dog onto a surface is how a refusal becomes a panic.
Do not tell your dog off for freezing. Punishment-based approaches are associated with fear and avoidance, and fear is the whole problem here.
Do not let visitors clap, coax or run across to demonstrate. An audience makes the floor worse.
Comforting a frightened dog is not a mistake. If your dog comes to you at the edge of the tiles, they are welcome. You cannot make fear worse by being kind to a scared dog.
Behaviour change is built from management plus reinforcement together, and reward-based methods are what the veterinary behaviour guidance recommends. The mats are the management, and 15 treats at the edge are the reinforcement.
What to expect
Owners usually describe weeks rather than months, with progress that moves around from day to day. If your dog also refuses stairs or the car, treat all of it as one veterinary question.
If the wariness has spread to several ordinary things rather than one floor, the Assessment is a better starting point than any single article. It is free and takes about 3 minutes.
Today's version, in one line: lay a mat path to the water bowl tonight, and feed 5 treats at the edge of the tile.