Dear Humbug,
I'm enjoying your immediate and direct angle on life. As you hum along I fully (if precariously) experience the hay, the fun-times, the moods, the teases. You're alive!
Cyclists and rabbits share a gripe faced with untrained dogs and their ignorant owners. I can appreciate the thoughts of an ecologically aware vegan companion animal like you, and I empathise, but it's not the dogs' fault when these things happen. Yes, perhaps there are too many dogs in the city but I think it's the cars we need to eliminate as a priority.
I guess that your assistant has plans to make all kinds of gadgets from other people's junk. I can vouch for the benefits of such labours of love - it's a fine way to get a bike on a budget with some basic skills. Do you know what she has in mind? I imagine it would be a challenge to get to the vet by skateboard, and wonder if you've tried any other green alternatives? A customised bike trailer maybe?