My Maltese puppy has been going on walks for around a month now, and the last week or so she has been barking and sometimes growling at other dogs. Before she was allowed to go on walks I took her to lots of places to see other dogs (an intro puppy class, garden centres, town centres, the park) with her in my arms. Her temperament seemed confident and, if anything, assertive (she was barking at her siblings when I visited and picked her up).
She's been going to puppy classes for the last month where they don't interact or greet each other and she has been settled and calm in all of the classes apart from the last class. Another puppy held eye contact with her and she freaked out and started barking uncontrollably. Since that encounter, on all her walks she barks and growls at other dogs. At a distance, she will cry/whine and pull to go towards them, it looks like she wants to say hello. When she is nearer them she will bark and sometimes growl but will circle them to sniff them. I have been taking her to look at dogs from a distance and giving her treats, but I'm really worried this is going to be the start of her being reactive.
Before her behaviour had changed, she had said hello on the lead to only a select few dogs as I'm very cautious about on-lead greetings. They were all calm older dogs. They all went well from my perspective and she seemed calm after.
I had a reactive dog before and I'm worried she's picking up on my anxieties. I'm trying to breathe, relax my arms and say 'oh look a dog' in a calm, positive voice.
Is there anything I should be doing? Should I consult a behaviourist?