Some good advice there fourcourners, thanks. I think I'll also take over a report/testimonial from our vet to indicate the type of owners we are, the fact that all animals are spayed (i.e. no breeding going on), the fact that they're all healthy with required vaccines, and report on size/ages to show that the dogs are all relatively small and three of them quite old, so no chance of chewing things, doing anything in the house, etc.