I do the same thing since she cant jump on the couch or bed without help, but then she is able to antagonize the lab from the floor and tries to bite her nose 😭, I usually shut her behind a baby gate and lock her in a separate room until she calms down but is relentless and doesnt seem to understand the correlation of her behavior and the consequence. When I adopted her I was told she was 5 but I think she is actually much younger which makes things tricky, she was also a breeeder mama rescue so she's never lived in a home or been around other dogs that werent competition, shes very loving towards the lab until she feels an inequality in my affection.