Are you going to let me out?

Desperate to get out of his carrier and car, Hector has made this hole in it over the months.

I bought this to bring him home on his maiden journey from Wiltshire at 8 weeks and it is still spacious enough for him now. He travels well and sleeps happily in it in transit.

We walked round Grasmere today, but Hector has now started to bark at bigger dogs. Why and what to do? Is it small dog syndrome?