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With the spring thaw and ensuing rain showers, the earthworms have got about their business again.
Actively burrowing through the soil, they have created little mounds of detritus at each wormhole.
When the ground has become overly saturated with water, they depart the safety of their subterranean routes and take an overland journey. The finely honed canine sense of smell readily sniffs out the characteristic earthy odour of worms and their abodes.
Once they have been identified, the rolling begins.If anything, dogs seem as keen on the little piles of detritus the earthworms leave outside their holes as the worms themselves. In between these two extremes are earthworms that reside in the top 10-30 cm of soil, the so-called topsoil or subsoil-dwelling earthworms that create elaborate subterranean tunnels and consume organic matter within the soil as they do so.The earthworms that dwell in the topsoil are crucial to soil conditioning. Not only do they break down organic matter to enrich the soil with nutrients, but they aerate the soil when they create their burrows. They will also use the casts as indicators of a worm beneath, and excavate the hole until the worm is found.

The worm is then merely chewed, not swallowed, as the real satisfaction is to be found in rolling in its mashed-up guts. If anything, it is most likely that a behavioural trait that promoted smelling foul would be unfavourable as humans selected dogs with which to live their lives.
In fact, on the basis of casual observation, almost all dogs seem to favour worms significantly more over faeces or even a dead animal. Given the delight that dogs seem to derive from it, a utilitarian purpose seems counter-intuitive as well. That is, the earthworms, or an organism such as a microbe or parasite that lives in or on the worm, manipulates the dog.
Given that worms and their passengers are not able to travel great distances, their existence is continuously at risk within this constrained environment. Crucially, there is also a greater risk of inbreeding and narrowing of the gene pool if mating also takes place within a very restrictively defined environment.Dogs provide a means for organisms associated with the worms to disperse more widely, to ensure greater opportunities for existence for the next generation. One could examine the distribution patterns of invasive worms and their associated microbes and parasites in relation to their attractiveness to dogs.

Dogs (and cats), despite domestication, are closer still to natural habitats given evolutionary time.
Their behaviour, in defiance of their companions, perhaps reveals an inner vestige of defiance.
The two dogs that live with us (we don't own them in a real sense) certainly show the same behaviour and absolutely no remorse upon a successful worm bath.
I'm trying to think of the mechanism that might result in domestication favouring behaviours that are not rewarded.
I've never had a dog roll specifically in worm casts but I have also never bathed my dogs, they never smelled doggy or unpleasant and the dirt just fell off their coats.

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