Bad tenants would totally suck and I really do feel for people who have been burnt by people damaging a property with pets. I think a pet bond should prob be around $500 on top of bond and perhaps a stat dec signed to say that the tenant would be liable for any extra cost incurred.
There are all kind of pet owners. Our cat was clean, flea treated and we got the carpets done every 6 months even if they didn't need it. I don't see it as a big deal for me as I know my cat never did any damage (because he mainly just snoozes) and after 4 rental properties all with excellent inspection reports and bonds back no question. Yes it's a lie but I don't see the big deal when there were no traces left of our furry friend when we moved out.