What sign might an owner observe indicating their Bolognese is experiencing patellar luxation?

Answer

Suddenly holding up a hind leg, hopping, or reluctance to use stairs

Recognizing signs of patellar luxation might involve noticing the dog suddenly holding up a hind leg, hopping, or showing reluctance to jump or use stairs normally.

What sign might an owner observe indicating their Bolognese is experiencing patellar luxation?
healthDogbreedBolognese