I showed this to my gal pal, an animal surgeon of 12 years. She's still laughing. Also: How does one shove their arm down a dog's mouth if the dog's mouth is

I showed this to my gal pal, an animal surgeon of 12 years. She's still laughing. Also: How does one shove their arm down a dog's mouth if the dog's mouth is already busy biting the non-free arm?