How to teach my dog an once-taught, but now forgotten trick?

Yes, your dog can relearn a trick. Most likely, they never truly forgot it.

It will take practice and patience, but if you can devote at least 15 minutes of training session each day, your dog will slowly remember. Also, try to see if your dog can perform the trick without the incentives of a treat during a random part of the day. Be supportive and kind to your dog, and they should remember the trick by a few weeks.

For example, for the trick "sit", you would hold the treat above your dog's head and command them to sit, gently nudging them into a sitting position if they didn't sit right away, and properly rewarding them. If you found training with clickers worked before, use that again.

Even if your dog had truly forgotten the trick, old dogs can learn new tricks, so you can certainly reteach the trick to him.

Sources:

• mypet.com - Tips on Training Dogs

• thesprucepets.com - How to Teach a Puppy to Sit