Let's start with a vampire bat transformation from the webcomic Vamp Sabbath.
Now we move on to art found on Twitter and FurAffinity...
From @FujoshiiNeko comes a Lycanroc sequence and a donkey sequence.
From @z_j1341, a gif of a stocky man turning into a buff werewolf.
A beefy minotaur by @Xantouke
An angry werewolf sequence from @ariyakonsuay
An ornery elephant from @mayobug_
Ian Ricky recommends several videos from LizSFX2016 on FurAffinity: "An Australian WereKangaroo in London", "Lizard Transformation in Virt-A-Mate test", and "Quest Failed - Minotaur TF"
From petplayer976, "fossil go brrr," a Megatherium (giant sloth) sequence
From @cig_tran, an animated fox
A dog sequence from @to7ny11
A group of goat, lion, and dragon drawings from @satumaimocat
From @koikoisararira, a falling fox
From @ragingwoodcock, an animated werewolf gif
A dragon sequence, "Running Start," by Nakase
A werewolf gif by amand4
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From hereon, all posts are NSFW!
"The Transformation of Casey Jones," a turtle themed sequence by Plastron (part two here)
A bull sequence, "Lunar New You," by Punkchops
A sequence from Emerald-Eye, "Curiosity Filled the Cat." Parts One * Two * Three
A werewolf shifting on his bed, by @z_j1341
From @sniperoftython, the donkey sequence "Rey's Predicament."
And from the same artist, another donkey sequence, titled "Nick's Grooming Problems." Nick's friend shows up, and soon afterward starts changing too. You can guess the end.
A beefy man-to-bull pic from @ShinOnizaru, who also drew this steamy werewolf, along with another hot-and-bothered lycanthrope and this great gorilla.
A man-to-boar sequence from @gymjunkiemuscle
"Date night mishap," a werewolf sequence by petplayer976
A folder containing the werewolf comic "BIILS," by VonBoche
A weightlifting lion sequence by OtherWords
"Aedrion and Stags," a deer sequence by Navajas
"It's not Paw-sible!!!", a werewolf picture by Sparks_99
A "Kinky Dragon" sequence by costin55 -- 01 - 02 - 03 - 04 - 05 (Thanks to Ian Ricky for the recommendation.
An age progression video by Agegrowthfictions. The listing is on Deviantart but the full video is on Dropbox. Remember that this is definitely NSFW!