I've just gotten back from the vet with Carbon and I'm feeling quite down...as in sitting in front of my frenzied Google searches and crying.
Business first: today Carbon had a blood draw to measure the impact two weeks of doxycycline is having on his liver. I also asked for another heart worm test. We'll go back on Friday to get the results and discuss next steps. The vet also gave me his drug treatment protocol for the full 35 weeks.
She ok'ed the Impromune - was very excited as apparently the main ingredient is shiitake mushrooms and she's all in favour of that. She was still going to look up the Florentero, but did warn that the probiotic component would likely be wasted as the doxy will just kill them off. She ok'ed kefir for the weeks that he is not taking the doxy.
Then we got into my questions about activity level. On Friday, she told me he could go off lead and run. I've been doing a lot of reading about 'slow kill' and restricted activity. Most say the dog should not only be restricted, but actually crated during the whole treatment for either slow kill or
melarsomine-based methods. For slow kill that means 10-12 months (or longer) and for melarsomine injection protocol, that means three months (or longer).
Today I expressed my concern about what I'd read about activity levels.
"Well, maybe keep him from playing with other dogs."
"But you understand even if he's by himself, he runs around in circles."
"In circles?"
"Yes, he gets the zoomies."
"What are the zoomies?"
"You know, these massive bursts where he runs around and around for a minute or so and then flops down in a heap."
"He does that even with no other dogs around?"
"Of course! He's a year old dog!"
"Well, maybe no zoomies,"
"But then I have to keep him on lead, because he always does zoomies off lead."
"Oh you know, it's really probably fine."
"Probably?"
"The truth is the worms can cause embolisms even if the dog is just laying down."
"So what is SAFE? I need to know what's SAFE so I don't kill my dog."
"Well, nothing's 100% safe, is it?"
Look, she is a very nice and patient woman who truly loves her patients. I fully appreciate that she is in new territory here with the slow kill method but I do not feel comfortable with all this. Every answer seems to come with a "let's see" or "should do", which is not inspiring confidence.
Regarding the activity, she did say that she's getting this from a massive shelter in Hungary where they are not able to restrict activity. Also in Spain, I was told to restrict Paul's activity for 24 hours after his melarsomine injections - that's it. The AHS says dogs should be crated 100%. All that to say that how long and how much to restrict activity seems to be a BIG question mark.
Now let's have a look at slow kill. The thing is, it can mean MANY MANY different things. So when you have the American Heartworm Society saying that slow kill doesn't work and to use melarsomine (arsenic derivative) injections because 'slow kill' will just prolong the damage to the dog and not kill the adults, it sounds really scary. Plus slow kill is continually cited as an irresponsible option used by dog-owners who can't afford the very expensive melarsomine injections (aka immiticide).
But what is slow kill? Depending on what study is cited, slow kill uses these drugs:
1. Moxidectin topical (Advantage Multi) plus doxycycline
2. macrocyclic lactone (often ivermectin which is in the Macrocyclic lactone family) topical plus doxycycline
3. Ivermectin tablet form ("Heartgard") alone
Complicating matters, one reason the American Heartworm Society is so gung ho
against slow kill is that they define it as #3 above. Why? Because due to the USA's screwed up drug manufacturers, it is very hard to get doxy, and when you can get it, it runs over $600 for a month supply. That would be over $7000 for 12 month treatment. Melarsomine injections (aka the fast and recommended protocol) is a relatively inexpensive $1000.
Anyway, back to the treatment. Within options 1-3 above, there are a myriad of protocols. Take doxy for a month and apply topical ivermectin once per week. Take doxy for two months, then one month off, then six months ivermectin twice a month.
There have been a few studies with slow kill - one with beagles that was the thing that got me crying like a baby - but none use the same protocol or the same medications. None mention exercise. Efficiency of clearing the dogs from adult worms ranged from 70 to 96%. The study with a 96% success rate used the same drugs as what my vet recommends, but in a much shorter study and without alternating the doxy on/off. It used 16 dogs, so a relatively small study. Another study shows that alternating the doxy as my vet wants to do has been shown to boost the doxy's ability to clear worms. In theory - and keeping in mind the very small sample size - that should mean that my vet's slow kill protocol should be around 97% effective over a 12 month period.
Finally, for comparison, the 'gold standard' recommended treatment using melarsomine injections has a success rate of 89% for the two injection method. This protocol also uses two months of doxy prior to the melarsomine injections. Of course with melarsomine, if the dog doesn't test negative with follow up heartworm tests, they repeat the melarsomine.
So to summarise my neurotic fears:
- Does my vet know what the heck she is doing?
- Do I let Carbon run or not? How much? How long?
- If I really restrict 100%, what does the slow kill method of 12 months without activity do to his quality of life and social development?
- If I don't restrict, so I just have to accept that he could keel over dead pretty much any time in the next year?
- In the year that this slow protocol takes, are the adult worms doing irreparable damage to his heart and lungs?
- What if we go through all this and he still will need the melarsomine, with the worms and damage in a much worse state after going through a year of slow kill?
- What damage will the slow kill drugs do to his immune and digestive systems?
It's really hard to know what it is the best for Carbon and to not worry, worry, worry.
