VetRepro

Stories and thoughts about small animal reproduction and ultrasound


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Aging of the canine prostate

Hi everybody!

In the next posts we will discuss a little bit about the prostate of the dog and will try to distinguish mythology from real life!

We all know that the prostate gland is changing in accordance with the age of the dog. These age-related changes have been documented in the veterinary literature. It is well known for example that the prostate gland commonly develops benign prostatic hyperplasia (BPH) in intact male dogs over 5 years, while in dogs older than 6 years signs suggestive of prostatic disease are commonly found.

The incidence of prostatic diseases has risen steadily over the past years as a result of dog’s life expectancy increase!  The overall median age of death is 11 years approximately and, according to the literature, there is a tendency to increase more. This is the result of several different factors, such as better management, better nutrition, owner education and improved veterinary care and prevention.

Most common prostatic diseases such as BPH, and cysts are generally asymptomatic at their onset and their early detection would allow the veterinarian to plan specific follow up and to recommend effective therapeutic protocols. So, a non-invasive screening of the prostate status and health would be advisable as a part of a preventive medicine program of geriatric diseases in dogs.

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The physio-pathological process of aging of the prostate gland has been well studied, but still no information is available about at what age, how often and even whether a screening program of the prostate health should be recommended in dogs. To define a screening program, the age when the examination should begin, is the first decision to be made. Due to different breed’s expected longevity, a dog of a certain age might be considered as geriatric in large breeds, and not geriatric in small breeds. For instance, small-breed dogs become geriatric at about 11 years, whereas giant-breed dogs at 7 years. Longevity in crossbred dogs exceeds that of purebred dogs by 1.2 years and increasing bodyweight is negatively correlated with life expectancy. Thus, the age for the early detection of abnormalities in the prostate could vary in dogs of different breeds…

On the basis of all these, our group decided to perform a study in order to estimate the recommended age for a preventive ultrasonographic examination of the prostate in the dog. In the forthcoming posts, we will present you the design of our study! So stay tuned!

Till then, enjoy your life and love your pets!

 

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Stories from Milan and thoughts about canine prostatic neoplasia…

One more time at Milan University! The Vet School still sitting there, full of veterinary histories as it was firstly established in 1791!  And always full of memories for me as I visited it for the first time back in 2004 in order to attend the 3rd ESAVS course of small animal reproduction. From that time till now a fruitful cooperation between the Clinic of Obstetrics & Gynecology and myself began…

Our latest research project is focused on the prostate of the dog. It may sound boring but it is not! Though the prostate is a well-studied gland, a lot of things have to be made clear yet. For example, a lot of discussion between breeders, dog owners and vets has been observed all these years, concerning the prevention of cancer of the canine prostate. Some claim that castration prevents cancer development while others don’t want to hear about it!  But the real question is “how common is neoplasia of the prostate of the dog?”. The correct answer to this could be something like “It depends”! In the following lines I will try to explain why.

During the 90’s and early 00’s it was believed that intact (= not castrated) male dogs have a high probability to develop prostatic neoplasia. So the common preventive practice was castration (orchiectomy in other words) which was performed at a very young age, even before puberty in some cases! Castration of course has some other strong benefits, such as prevention of development prostatic benign hyperplasia, prostatic cysts and other pathologies of the gland. Without a doubt castration is also a great “tool” for the control of stray dog population, that has to be combined with education of the owners.

These advantages are all true. Except one: prevention of neoplasia! In the (not so) recent literature it is well demonstrated that “neutered males had a significantly increased risk for each form of prostatic cancer. Neutered males had an odds ratio of 3.56 for urinary bladder transitional cell carcinoma (TCC), 8.00 for prostate TCC, 2.12 for prostate adenocarcinoma, 3.86 for prostate carcinoma, and 2.84 for all prostate cancers.”(Bryan et al, Prostate, 2007).

And of one the Guru’s of small animal reproduction, Michelle Kutzler, makes things clear enough: “Not only does castration not protect against future development of prostatic neoplasia in dogs, but incidence of prostatic neoplasia is higher in castrated dogs” (Neoplasms of the Prostate in Small Animals, The Merck Veterinary Manual, 2013).

These infos also reflect my own feeling, deriving from my almost 20 years’ small animal practice experiences. The “true” and “real” cases of prostatic neoplasia that I have seen are less than 5 (3 as far as I remember). “True” and “real” mean “proven” by histologic or cytological examination of prostatic samples taken with biopsy or fine needle aspiration (FNA). On the other hand, diseases such as benign prostatic hyperplasia, cysts, prostatitis (= inflammation of the prostate gland) are almost everyday practice to my experience…

But in several congresses and several discussions with vets from other countries, I realize that scientific community is really worried about prostatic neoplasia prevention and treatment! How can it be??? Am I missing cases? Or maybe vets from other countries are overestimating the frequency of prostatic neoplasia development? Well, none of these…it’s a matter of …let’s say… “culture”! And I will explain you what I mean: In countries of the southern Europe such as Greece or Italy, castration of the male dogs is not so familiar as in other countries such as Great Britain, USA, Belgium and maybe France. Castration is mostly performed in cases of prostatic disease (for example benign prostatic hyperplasia or prostatic cysts), very very rarely in young dogs and almost never in dogs before reaching puberty! As a result the incidence of prostatic cancer is low!

So when we are studying or discussing the epidemiology of prostatic diseases we also have to consider the possible differences between countries.

Also we have to keep in mind that early castration (despite what was common belief) increases the risk of development prostatic neoplasia! But on the other hand has many many many advantages – that will be fully discussed in the near future! In any case, your vet knows the pros and cons and always decides the best for your dog, depending the problem, the current health status, the age etc etc etc!

Merry Christmas to all!

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