An interesting article citing memorabilia from François Dosses book “Gilles Deleuze and Félix Guattari: Intersecting Lives”: http://critical-theory.com/deleuze-guattari-biography/
I see no negative material. Unless being afraid of psychotics and their unpredictable dramatic behaviour is contemptible. I myself teach English in a technical college and I like the students. However, some friends ask me “how can you stand those guys?” Are they nasty people because they ask a perfectly reasonable question given the sometimes turbulent behaviour of such students? (Admittedly very mild when compared to psychotics). I think not. To each his preferences and commitments. Being in an establishment, as Guattari was, where one had to be constantly ready to drop everything to deal with dangerous behaviour is not everyone’s vocation.
Nor does this anecdote reflect unfavorably on Deleuze’s general attitude to “schizos”. I went to Deleuze’s seminar from 1980 to 1986, and sometimes it was interrupted by some very strange interventions. I was always impressed by how calm and courteous Deleuze was, and how he usually managed to make the exchange relevant to the subject at hand.
On the subject of Deleuze’s negative remarks about “dogs”: Deleuze thinks in terms of the behaviour of assemblages, not of individual elements such as dogs per se. I think the “human-dog” assemblage can sometimes have some negative instantiations. For example I do tai chi in a public park in Nice. Some dog owners think nothing of walking between the ranks of those doing the long tai chi Form together, and letting the dog bark and yap next to someone who is concentrating on the movements, and this on a space where dogs are forbidden. This is the sort of behaviour that Deleuze condemns, and quite justly.