A recent thread on Tick-L, an excellent list about tick borne diseases (TBDs) in dogs, dealt with an allegation relayed from another list, that "healthy animals won't be troubled by ticks and if they are, the TBDs won't bother them."
The belief that a healthy animal can't be stricken with a tick borne disease is just more magical thinking. Given the growing prevalence, and seriousness, of these diseases, what is needed is not magical thinking, but rational thinking.
Of course there's nothing irrational in saying that an individual with a healthy immune
system will be able to resist infection with a pathogen better than an
unhealthy individual, but that's just a piece of the picture. Health
and disease resistance are in a constant state of flux in all
individuals. I'm perfectly willing to postulate healthy animals can
resist or recover from TBDs more successfully than unhealthy animals,
but that hardly means they are immune to TBDs.
Some threats are what we can call "opportunistic," in that they take advantage of some weakness in the target to reproduce or infect or attack. Others are not particularly opportunistic, attacking based on broad parameters like movement (eg, ticks will jump on anything that walks by).
The ability of a predator, pest, or pathogen to identify a susceptible target is obviously a survival advantage for it. It's equally a survival advantage for the target to have developed the ability to outwit, outrun, or otherwise thwart the attack. This evolutionary dance happens with large animals, with microbes, with all forms of life. It's happening in your body and even in your cells right now, and it's happening inside every tick and every dog as well.
The question is, is it a survival advantage for a tick to bite a sick, weakened animal over and above a healthy one?
I can certainly see that the pathogen inside the tick would "prefer" it to bite an animal with a defective immune system, because this would make it easier for the pathogen to successfully reproduce inside the animal. But the tick?
I don't know the answer to that, because I've never seen any evidence either way. I am sure there are those who have information on what makes hosts more and less attractive to ticks, but I don't.
But just because one pest, such as the flea, or one predator, such as a wolf, is demonstrably more attracted to a weakened target than a healthy one, doesn't automatically mean that ALL pests or predators are. There are many different survival strategies that have been successful for species. That's just one.
So I think it's scientifically ignorant for anyone, no matter how firm a believer in a holistic path, to blindly assert that healthy animals will not be bothered by ticks. Are healthy animals less susceptible to bullets in the heart? To falling off a roof? To drowning? To a massive overdose of poison? Why, then, would they *automatically* be less susceptible to ticks? Why are macrothreats so easily understood not to be opportunistic, but microthreats are so easily assumed to be? It's not logical. It might turn out it's true, but it's not logical on the face of it.
There are those who are skeptical in the other direction, believing firmly that eradicating threats is the most reasonable course to take to protect their pets. They advocate the opposite extreme, the idea that we can strafe bomb the world, and our dogs, with chemicals, drugs, and vaccines and render them perfectly safe and immune to disease, pests, and predators. But this is also a form of magical thinking. The reality is that there's a lot of risk out there, and no way to protect against it all, and that sometimes the very things we do to protect our animals end up harming them.
Ultimately, we do the best we can with the information we have. What I fight, and resist, and detest, is the desire so many people have to refuse to reconsider their own cherished beliefs, and the choice so many people make to shove their heads firmly and deeply in the sand. (Sand being my second choice of words there.) The minute people decide they've reached the Sacred Ground, plant their flag, and refuse to budge, they're in trouble and unfortunately, so are their dogs, and the dogs of all the people who follow that flag.
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