My golden retriever LOVES the oils, my chocolate lab doesn't, she doesn't mind if they're diluted. I'm pretty sure it's because she has a great sense of smell. The golden however lives her hips getting rubbed down, she's 10 and they help ease joint pain for her.
I think Lennie can also be tied to the symbol of the dog. In the book Lennie's loyalty to George is similar to that of a dog, like when George says, "I turns to Lennie and says, 'Jump in.' An' he jumps." Another way dogs symbolize Lennie in the book was that Lennie and Candy's dog were both shot to prevent suffering.
Homemade Electrolyte Recipe - 1c water, 2 tsp. sugar, 1/8 tsp. salt, 1/8 tsp baking soda. Use full strength for chickens that are very dehydrated, or mix into drinking water 1 c to 1 gallon of water. For chickens, dogs, cats, horses, & other animals.