The best way to apply a poultice is to place the pre-made pad or homemade mixture on the hoof, then wrap with bandaging material, secure with self-adhesive bandage and finish with a protective layer of duct tape.

What's the best way to treat an abscess?

BY DR. NORA CHAVARRIA


Abscesses are usually caused by a bacterial infection which is localized at a certain point in the body. Dead white blood cells and bacterial matter create a build up of pus, which creates pressure. Abscesses in the hoof are especially painful, because the hoof capsule is a restricted environment - there's little room for expansion, especially between the hoof wall and the coffin bone. To heal, abscesses need to break out to the surface of the body and drain, and they'll follow the path of least resistance to get out. If an abscess isn't able to break open and drain, the infection can become more widespread.


If your horse has a hoof abscess, your veterinarian is likely to recommend using a poultice to draw out infection. A poultice is a soft, moist mass that is applied to the hoof under a bandage, which can be purchased or homemade, using a variety of medicated, or natural ingredients.


Commercially-available products contain an anti-septic and a poulticing agent, such as tragacanth, a sap-like plant material, on a ready-to-use pad. You soak the pad in warm water, apply the poultice directly to the bottom of the foot, and bandage it in place. You can also use a homemade poultice such as a paste made from sugar and iodine or Betadine® solution. Sugar is osmotic, which means it will draw infection out. Iodine/Betadine® is added as a disinfectant. Another popular homemade poultice combines two parts wheat bran, one part Epsom salts and enough water to moisten the mixture.


A hot poultice applied to the bottom of the foot will soften the sole and encourage the abscess to break. After the abscess has broken, you want to keep the wound open to continue draining. If the wound closes over at the surface, but infection is still present inside, these are perfect conditions for an abscess to occur or re-occur. Poultices keep the opening moist and encourage drainage.


Changing bandages daily is recommended, as a poultice can dry the foot out if the abscess hasn't broken. Soaking the hoof in warm water and Epsom salts (two cups to a gallon) between bandage changes is also a good practice.


When the abscess bursts, the pus will come out, but the open wound then needs to fill with granulation tissue, which takes about three to four days. Once the granulation tissue is in place you don't need to bandage anymore.



Abscesses in Other Places

A hot pack may be used for abscesses in other areas of the body. Causes of abscesses in other areas of the body include Strangles and muscle injections or puncture wounds that have become infected and healed over at the surface. A hot pack application opens up the blood vessels in the area, increasing blood flow and leading to an increase in local inflammation, which helps encourage the abscess to open and drain. You shouldn't use the same osmotic material directly on the surface of the skin, as you would with the hoof sole, because skin is more tender and it could cause irritation.


For a hot pack, you can put bran or mashed potatoes in a resealable plastic bag and warm it up in the microwave (not too long). Wrap the bag in a towel and bandage it against the area of the abscess. You don't want to use anything hot directly against the skin. You can also purchase a hot/cold gel pack, the same as for humans.


Poultice vs Antibiotics

With foot abscesses and Strangles, a poultice is preferred over the use of antibiotics for several reasons. First, because you always want to be cautious to not over-use antibiotics - it's always best to let the horse's immune system do its job when it's capable of doing so. Second, the use of antibiotics is contra-indicated in many instances of abscess, unless it's accompanied by a life-threatening condition such as pneumonia. Antibiotics can cause a capsule to form around the abscess, creating a pocket of bacteria which may promote antibiotic resistance. In the case of strangles especially, the bacterium Streptococcus equi subspecies equi (Strep, equi) can travel to other places in the body and create new abscesses (called bastard Strangles).


You want an abscess to drain - that's the primary goal for treatment. A poultice is the most effective means to do so.  


Dr. Nora Gbavarria, who is originally from Germany, is a clinical associate in equine field service at the 'Western College of Veterinary Medicine's Veterinary Medical Centre.


Horse-Canada.com    November/December 2018 



What to do if your horse is the unpopular kid

BY  ANTONIA  J. Z.  HENDERSON,  PH.D.


Negative interactions, including squeals, pinned ears and bite and kick threats, are a necessary and normal aspect of establishing and maintaining social hierarchies, and don't necessarily mean that horses are not getting along. These "ritualistic behaviours" (i.e. an abbreviated stand in for the actual behaviours that they mimic) tend not to escalate into aggressive encounters. Horses lower in the hierarchy quickly learn to acquiesce in order to avoid unpleasant and costly interactions.


Herds work best with horses that have been well socialized as youngsters; unfortunately horse owners rarely have control of their horse's early socialization experiences. Ensuring that horses have ample space to flee a persecutor, providing opportunities for "pre-meetings" over a stall wall or paddock fence to find compatible combinations, making resources plentiful (i.e. providing more feeding and watering stations than horses, and ideally more than one shelter), and keeping groups stable will all work to optimize herd harmony (see tinyurl.com/herd-harmony). Having done our best to set up herds that are likely to succeed, we are often better to let horses work out their own social order, without intervention.


That said, sometimes the herd does not work. Horses living in natural conditions make their own decisions about whom they befriend and who best to avoid. Now we are making these decisions for them. Individuals may be incompatible with the group for any number of reasons that equine scientists have yet to understand. For the safety and harmony of the entire herd, the outsider may have to be removed. Removal does not mean your horse will never know the benefits of herd living. In another group, with different social dynamics, he may well find an agreeable niche.


In truth, equine scientists (myself included) do not know exactly why some horses are ostracized. There is, to date, no research on ostracism in horses, or any of their equid cousins. Neurobiological studies with primates suggest that the social pain of ostracism and physical pain originate in similar areas of the brain and trigger similar neural mechanisms. According to "Social Pain Theory," when social animals are excluded from the group, the pain of that exclusion functions as a "neural alarm system" that prompts the threatened individual to do what is required to avoid these painful feelings in the future. Thus, social exclusion offers evolutionary advantages by promoting group cohesiveness, as group members are motivated to avoid the pain of rejection by forming effective social bonds.


This theory does not offer much advice about what might be done for an ostracized horse. If you have read any of my previous articles you will know that I am a zealot for group turn out. However, if you have done everything you can to optimize peaceable herd dynamics and your horse is still suffering either physically or psychologically from this social exclusion, removing your horse from the herd and trying to find a group that is more compatible may be the most humane choice.


Antonia ].Z. Henderson, a psychology professor at Vancouver's Langara College and equine psychologist, researches, teaches, consults and writes about human/ animal relationships. She has owned, bred, imported and competed her own horses in hunter/jumper and dressage, and has managed and taught at a number of hunter/ jumper facilities.


Increase the odds of a newcomer being accepted into your herd by keeping them in separate paddocks initially, allowing them to "pre-meet" over the fence, and get used to one another.


 November/December 2018 | Horse-Canada.com