Lyme disease and aggression

[mmgy]

I had not heard of this, but thought it might benefit those in high-risk Lyme areas, and those working in rescue evaluation. Best I can tell, this originated in the Dallas/Fort Worth area. It's been passed through a few lists.
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This is from our local Dallas/Fort Worth DFWCares rescue list.
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Permission was given to cross post this.

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We recently had a very strange event that I think we should share around the rescue community:
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Young (~2 years) male, a Lab mix, came into our program with a "questionable" background. He may have been aggressive toward some children, maybe not. We kept him for a good long while --- months of fostering in our premier foster home, with no problem -- and placed him carefully, with a single mid-age man who absolutely adored him. We also, as we do with all our dogs, tested him for Lyme. He had it; we treated it; case closed -- we thought.
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Everything went very well after adoption -- he was the star of his obedience classes, a frequent alumni visitor to our clinics - for over a year. And truly adored by his adopter.
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Then, over a year after placement, Mojo became suddenly, erratically, and seriously aggressive: literally attacked visitors to the home, people at the vet's waiting room, etc. Terrifying. Very sudden. Totally inexplicable. He was returned to us with genuine heartbreak from a very loving adopter.
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Mojo then went to our regular vet and was a totally different dog: bared teeth and growling to anyone who approached his kennel, lunging at other dogs when being walked, etc. We figured that whatever was happening with him, he had become implacable and started a TDC (Tough Decisions Committee - something we "convene" and that is open to anyone with an interest in the dog when we think that euthanasia might be an option).
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However, someone at the vet's office said that perhaps we should test him for Lyme. Huh???????? They had had a regular client of theirs come in recently with similar, out of the blue aggression, and it turned out that was the problem - puzzled them, but seemed to be the case. Okay -- hey, we'll try anything -- so we had him tested. He was high positive! Fine, we started treatment while we continued to figure out what to do with him via the TDC.
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Almost immediately, however, once the antibiotic> were begun, the Mojo we knew came back!! He was himself again -- bouncy, happy, a bit neurotic, but not at *all* aggressive! The staff at the vet's was amazed, but all confirmed this change.
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We didn't believe it; and the veterinarians didn't believe it .... BUT a thorough search of the internet turned up a number of studies and anectodal observations indicating that in some dogs (and in some humans!!) the primary symptom of their Lyme Disease can be sudden, irrational and serious aggression.
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Well, we've known for a while to check the thyroid levels of dogs that show aggression that just "doesn't fit". Now we have added testing for Lyme as well. And we have --- results not yet in -- another dog that we placed over a year ago who has been returned because of out-of-the-blue aggression ... and he has also tested high positive for Lyme! We've started treatment and will be monitoring his response.
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So --- plug this in to your protocols. It's worth checking out. I spent the day today with Mojo ... and he truly is just the same dog we placed over a year ago. (We've let his original adopter know -- because he vowed that it had to be *something* causing this behavior. But he cannot take Mojo back because his roommate, one of the people attacked, won't even consider it. For the record, there were no skin-breaking contacts in any of these attacks, but plenty of fear and we consider them as serious as if they were full-fledged bites.)
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We actually have additional insight into this because one of our volunteers (human) has had Lyme Disease. Took many months for her to be diagnosed, and once she was, she learned that it's a VERY nasty bug that really remains around permanently, waiting for a chance to "crop up" again. When we place Mojo again (and our TDC unanimously agrees that we should do this), we're going to explain the background, these amazing events, and require that the adopters have him tested every six months, whether or not he's showing symptoms. We have no idea whether that will work or be sufficient - we're rather flying blind in this -- but it seems a rational approach.
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I'll post again if we learn more from the second dog (also a Lab mix). But based on what we know now, it is a real possibility: Lyme *can*, in a few rare cases, cause aggression, aggression that can be reversed.

[Shaw_2112]

Very interesting , thank god I'm not in a high risk area.

[frontierrots]

We have had severl clients whose dogs have had sudden personality changes- aggressive, neurotic etc and the dogs have all turned out to have Lyme. Very interesting that someone else has seen this

[Brooke&Ryan]

WOW!!!

Julius has Lyme but we haven't noticed any behavior changes. That's kinda creepy...

[Squeaky2004]

I have never heard of that before either but it is an interesting and informative bit of information.

[mmgy]

Originally Posted by Brooke&Ryan

WOW!!!

Julius has Lyme but we haven't noticed any behavior changes. That's kinda creepy...

This is EXACTLY why it rang a bell with me. I know Lyme has affected quite a few families here, and this is a new "symptom".

[Brooke&Ryan]

Originally Posted by mmgy

This is EXACTLY why it rang a bell with me. I know Lyme has affected quite a few families here, and this is a new "symptom".

Mary Mac---

That really creeps me out. I have done quite a bit of research on Lyme & different treatments but have never heard of it affecting their behavior. Scary....