Kind of related to the question specific to Topsy the elephant, the (somewhat famous) Oatmeal comic about Tesla claims, among other things, that Edison would pay schoolboys to kidnap people's pets, after which he would publicly electrocute them.
Verifying this claim is rather difficult; electrocuting animals was indeed a thing during the War of Currents and many articles cite more famous cases, like the one with Topsy. In addition, it seems it was actually Harold P. Brown and not Edison himself who advocated electrocuting animals (some accounts, however, suggest Edison hired him to do so).
That said, I found these two sources:
Edison the Executioner claims Edison himself was "killing cats and dogs by luring them onto a metal plate wired to a 1,000 volt AC generator". It also later states that "Edison himself offered a bounty of 25 cents for every animal caught and delivered for the experiments".
Myths and Mysteries of New Jersey: True Stories of the Unsolved and Unexplained likewise claims that he himself "purchased stray cats and dogs from local schoolboys for 25 cents each". In addition, it claims that animals used were (ironically) initially provided by the ASPCA, before they were aware of his plans. While it also claims many of these were actually conducted by Brown, it clearly states Edison was orchestating the whole thing.
Neither of these, however, make any mention of Edison using people's pets. In addition, the Wikipedia page for Brown claims that "Brown would continually claim he had no actual association with Edison". My question here is therefore twofold:
Is there any proof that Edison (or someone else on his behalf) kidnapped people's pets for use in his (cruel) demonstrations?
How many of these public executions of animals were actually conducted by Edison himself, in person? While it's clear that Edison was supporting (financially and via other means) and in many cases even initiating these, I got the idea (which I failed to either prove or disprove) he was trying not to personally get involved in these (possibly as to avoid the reputation that goes with killing innocent animals).