Perodicticus potto
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I'm assuming here, but I think the problem with plexiglass is that it quickly gets smeared with fingerprints, making photography impossible, with or without a flash.
Yes, this is one of several disadvantages of using glass for zoo enclosures. A more worrying problem from an animal-welfare perspective is that when an enclosure is surrounded by glass, a depressing number of visitors (not all of them children) feel compelled to bang on the glass to "get the animals' attention. " This is very stressful for the animals. (I normally have a suggestion for what should happen to people who do it repeatedly, but it would be in poor taste in this thread.)
There is also the issue that, while glass offers a good view of animals, it tends to block out other sensory stimuli such as sounds and smells, giving visitors the impression that animals live in a hermetically sealed world. Since most zoos have education as one of their aims, this is a concern.
Glass walls also do not have much potential for providing additional environmental enrichment to the animals. This may not be as much of an issue with dogs as it is with some other species, but animals that naturally climb or perch tend to be happier with mesh barriers that give them extra opportunities to express those behaviours (however "prison-like" such barriers may seem to human visitors).
I took a course on zoo design and husbandry as part of my animal care diploma. Designing enclosures involves balancing many different considerations, but in my opinion the animals' best interests should always come first.