Why does my dog ​​bleed from the penis?


80% of dogs older than ten years have the prostate gland larger than usual

  • Publication date: January 30, 2012

Prostate conditions are quite common among middle-aged and elderly dogs. Sterilization is the best way to prevent and cure these types of pathologies. In most cases, prostate conditions are caused by male hormones. Early diagnosis and proper treatment help to control the disease satisfactorily, in most cases.

Pathologies related to the prostate have very varied and different symptoms between some dogs and others. In some cases the disease diagnosis It's very serious.

Pathologies related to the prostate have very varied and different symptoms between some dogs and others

The size of the prostate varies greatly with age and it is estimated that 80% of dogs older than ten years of age have an abnormally enlarged prostate gland, although there is no specific symptomatology in this regard. So, according to Manuel Lázaro of the Mirasierra veterinary clinic, "the determination of normal prostate size is very relative and should be assessed with caution."

Prostate diseases, regardless of their cause, have a series of symptoms that can be divided into four groups:

  • Urinary signs, among which are, more frequently, bleeding from the penis, although the dog does not urinate, in addition to blood urine, difficulty or pain when urinating and urinary incontinence.
  • Digestive symptoms, due to the pressure of the prostate on the intestine, so that constipation, pain when defecating or other changes such as stool look crushed.
  • Locomotor signs, which are less common than those mentioned above and are characterized by symptoms such as lameness, stiffness due to the pressure of the prostate on the nerves after the prostate area.
  • General symptoms, which are very common. In fact, symptoms such as fever, generalized pain, depression, lack of appetite, weight loss or vomiting occur in more than half of the cases.

Male hormones

There are many prostate diseases and most of them are induced by male hormones. That is why castration is a very effective preventive treatment. Prostate diseases have different processes:

  • Hyperplasia or enlargement of the tumor type gland. It is due to hormonal influx. This case is one of those with the best prognosis regarding treatment and cure expectations.
  • Prostatitis or bacterial infection of the prostate. It is one of the most frequent cases. It can occur suddenly and remain chronic.
  • Prostate tumors It is less common and it involves cysts with fluid accumulation that, in general, are malignant.
  • Prostate cysts They consist of an accumulation of liquid inside. These cysts, sometimes, can reach very large sizes.

Early diagnosis

Faced with prostate pathologies, the best weapon is the early diagnosis and the application of appropriate treatments. The quick reaction of the owners to go to the veterinarian against the following symptoms is essential:

  • Constipation.
  • Difficulties urinating
  • Presence of blood in the urine.
  • Lameness or strange way of walking.
  • In some cases it can also appear: fever, malaise, depression, lack of appetite, weight loss or vomiting.

Diagnostic methods The most effective method for a proper diagnosis is the ultrasound. The treatment can be medical or surgical. It depends on the type of pathology, degree of condition or age of the patient. If the treatment is with antibiotics, it can be:

  • With antibiotics Especially in the case of infectious prostatitis. Antibiotics penetrate the prostate with difficulty, so they must be specific and taken for quite some time.
  • With hormones To alleviate the production of male hormones, responsible for prostate pathologies.

When the treatment is surgical, there are three options:

  • Castration. It is the most frequent alternative.
  • Drainage of the cysts, to empty their contents and prevent their reproduction.
  • Prostate surgery It is indicated in the case of tumors. It is a complicated operation and carries a risk of side effects, such as urinary incontinence.

According to Manuel Lázaro, veterinarian:? Prostate diseases are very common in dogs, as is the case with men, from a certain age? and adds that, in general, the prognosis is good, but requires a good and early diagnosis and treatment.

Go to the veterinarian when symptoms such as: lameness, constipation, blood in the urine or loss of appetite, among others.

From the age of seven or even before, as determined by the veterinarian, carry out periodic reviews to detect and diagnose the disease as soon as possible.

Follow the instructions of the veterinarian regarding treatment, once the dog has been diagnosed.

Keep in mind that castration and sterilization are effective preventive methods against the disease.

Blood, alarm signal

Normally, unless our dog has had an accident, such as an outrage or a heavy fall, cases in which we will have to run to the veterinarian to assess whether the bleeding comes from some internal trauma, we will see a few drops of fresh blood, at the beginning or end of urination.

It is also possible to detect blood in the puddle that forms urine in the soil. But why does this bleeding from the penis occur? If so far we have not noticed anything strange in our dog, we must look at some details: Do you urinate more or less times than normal? Costs? It hurts? Are you apathetic? All this we will tell our veterinarian to reach a diagnosis and, of course, a treatment.

The most likely causes of penile bleeding

Discarding systemic diseases, which would lead to other more obvious symptoms, the presence of blood in the urine is related, fundamentally, to diseases in the urethra, penis, bladder and prostate. Thus, we can differentiate two diagnoses, those related to the urinary system (urethra, bladder) and those related to the reproductive system (prostate), although it is obvious that they interact with each other. In both cases, the veterinarian will perform the relevant tests. Keep reading in ExpertAnimal to discover the most frequent pathologies:

Problems in the urinary system

Stresses cystitis (as in human medicine), but there may also be bladder and urethra stones. The veterinarian will be in charge of analyzing a urine sample. To get it, you can provide us a collection bottle, like the one used in human, so that we put under the jet when our friend raises his leg. Sometimes it is not possible to obtain urine or it is not reliable and you have to resort to direct puncture of the bladder. Of course, it is a technique that the veterinarian must perform.

If there is infection, it is normal for us to find bacteria, abundant lymphocytes (they are the white blood cells present to fight infections) and hematuria, which is the presence of blood, the same that we have seen coming out through the penis. The treatment is carried out through the use of antibiotics and the animal usually responds favorably in a short time. A second analysis is usually requested to ensure that the bacteria or stones have subsided.

When the problem is the prostate

The prostate is a sex gland that surrounds the urethra. There are three conditions that can cause its enlargement, which is what will cause blood to flow through the penis. Are the benign prostatic hyperplasia, the prostate cancer and the prostatitis. To explain why penile bleeding we will focus on hyperplasia, which is the disorder that may be responsible for hematuria.

Benign prostatic hyperplasia

The diagnosis is made by the veterinarian through a rectal touch. With palpation determines size, position and consistency of the prostate. If it is enlarged, it gives us the explanation of why our dog has bled from the penis.

This hyperplasia is hormone dependent (testosterone), which means that the disorder will appear in non-neutered males of middle and old age. Enlargement can also cause difficulties in urination and defecation. If finally this is the answer to why our dog bleeds from its "parts", the veterinarian will assess the option of the castration.

Another advantage of castration

There are many advantages of castration in dogs, except in some specific cases of behavioral problems. And although in this article we are not going to detail the complete procedure, we must point out that yes it is possible to operate geriatric patients, provided that your preoperative tests obtain satisfactory results. And, although there is also pharmacological treatment, castration is the only method that completely eliminates the stimulus that enlarges the prostate. Thus, shortly after the intervention, its size decreases and the problem does not recur.

This article is purely informative, at we have no power to prescribe veterinary treatments or make any kind of diagnosis. We invite you to take your pet to the veterinarian in case he presents any type of condition or discomfort.

If you want to read more articles similar to Why does my dog ​​bleed from the penis?, we recommend that you enter our Diseases section of the reproductive system.


Hello, I have a puppy of the 10-month-old cane corso breed that for a week has occasionally taken a few drops of blood through the penis in, not when urinating. Eat well, play as usual and do not complain of pain. In a continuous way, it seems to be more frequent when you get excited about something. Thank you.

It could be cystitis or urinary stones, so you should urgently go to your veterinarian to examine and determine the cause to indicate a specific treatment.

I wish to receive news about your improvement.

Is it normal to see blood in the dog's urine?

As long as it is a small droplet that is present at the beginning or end, it can be normal, especially if this is not accompanied by a certain decay in the animal, that its urination is either too distant or very frequent (more than usual) ), What present difficulty urinating and in fact, if the dog has not suffered any trauma or run over that suggests some internal bleeding should not shed blood through his penis.

What causes penile bleeding?

Your dog may be suffering from diseases related to your urinary tract, such as the bladder and the urethra or the reproductive system such as the prostate, the penis may also be suffering from some pathology.

In the case of diseases that affect the urinary tractThere may be, for example, presence of stones in the urethra or bladder or our dog may have cystitis. The way to determine these pathologies by collecting some of the dog's urine in a container to take it to the veterinarian to perform the necessary tests and / or in extreme cases, this can be obtained by means of a puncture in the bladder.

The presence of bacteria in the urine are indicative of infection and traces of blood would confirm that there is bleeding from the penis, in any case, the veterinarian will prescribe the corresponding antibiotics and as soon as the treatment is finished, a second sample is made to verify that the infection has been eradicated.

The prostate conditions They can also be the cause of blood in the dog's penis, specifically benign prostatic hyperplasia manifests with the presence of hematuries.

In order to diagnose it, it is necessary for the veterinarian to perform the rectal examination in order to determine if the prostate is larger than normal, if its position and consistency to the touch is adequate and thus bleeding would be explained, in addition to the difficulties in making physiological needs.

As usual, this appears in males and adults of middle or old age that have not been neutered, therefore if the diagnosis coincides with this disorder, the veterinarian will probably opt for castration.

If your dog is already something older, you should know that it is perfectly feasible to proceed with castration, of course, must undergo a series of preoperative exams whose results must realize that it is suitable for the procedure, so within a few days of castration the prostate will reduce its size again and without risks of becoming inflamed again as testosterone production has been inhibited and with it the possibility disappears of inflammation

Other pathologies that affect the prostate are the prostatitis and prostate cancer, these will be determined by the veterinarian with routine exams and procedures.

Is your dog not sterilized? You may have prostate problems

If your dog bleeds from the penis when he urinates and is not neutered, he may have prostate problems. This type of ailments is usually stopped through sterilization, but in some cases and especially in older dogs, prostatitis, a tumor or a cyst can develop.

A prostatitis is caused by the attack of the bacteria on your organ, the cyst is due to an accumulation of fluids that cause pressure and the subsequent evacuation of blood. The tumor is the most worrying case of these three cases, It is malignant and requires surgery. In any of these situations, your dog will show discomfort when walking and urinating, fever and constipation at times. If this happens, it is urgent that you consult our veterinarians online.

Do you suddenly pee much more frequently and can't seem to control it? It can be cystitis

Dogs can have cistitits as do humans. Cystitis is an inflammation in the walls of the bladder, where we store urine. By reducing their space, your dog can not stand the urge and pisses much more than before. Sometimes, This urine appears accompanied by some blood in the penis or in the vagina if we are talking about a dog.

Other symptoms of cystitis is that you will see that he complains after peeing, as if he himself did not understand why he is so eager to do so. If your dog has these symptoms, consult your veterinarians online right now.

4 replies

Classic answer take it with your veterinarian, I better not ask what experts they are. xd this is not a forno or anything like that, logical answers hahahahaha - rafa Mtz

Good ... My dog ​​was neutered less than a year ago, he is two years old and I have noticed that where his testicles were going, he has a kind of bladder, why is that? What should I do? Thank you - Sol B Guerra A

My dog ​​is bleeding from his penis and I don't know if it's because of excitement, my other dog is in love - Melannie Mendoza Villanueva

My puppy is barely 2 years old and has a heavy bleeding in his penis, and he gets fours and has an inflamed tip of the penis, I'm worried I can do - Keisha Archbold

- Anonymous right now

Hello there and a dog from my vesino that has long dripped blood through his penis and leaves blood everywhere he walks or lies can be contagious for other dogs or for humans - Carlos Paredes Castro

Please help me there is a street dog that I love very much has these symptoms I do not have money to take it to the vet could you tell me the name of antibiotics - Fiorella Ance

Good morning my dog ​​woke up dripping blood from his penis but I see him very well emotionally, what I do in this situation - Aaron Quiroz

If someone can please say the name of the antibiotic, I have my dog ​​that other dogs bit his penis and he is bleeding a lot we don't know what to do, we try everything - Black Truck

Have you taken medication or are you with chemo?

Certain medicines or going through a chemotherapy process can reduce your dog's immune system so much that it facilitates the entry of bacteria into his body. If they reach your urinary tract they will develop an infection that will cause blood to urinate.

You can also manifest blood in your penis because of an infection because of kidney stones or because of a tumor.

Blood in the urine may be a symptom of canine diabetes

If your dog is suddenly very thirsty and pisses a lot, if he is always hungry even if he has finished eating and you notice little active you may have diabetes. Diabetes is an inability of the body to produce insulin, which causes blood sugar levels to be too high because insulin controls this value.

So much blood sugar raises your glucose, of course, which facilitates the entry of bacteria into the urinary tract, which can consequently cause the expulsion of blood from your friend's penis. If it turns out that your dog has diabetes, don't be alarmed, with the right treatment he will live as well as a healthy dog.

Your dog may bleed from the penis from an injury.

Sometimes, the causes for which your dog urinates blood are not a tumor, diabetes, cystitis or any urinary infection, sometimes it is an injury that has suffered hitting against something or playing with another dog. If this is the reason, it will stop bleeding after a few days if the stroke has been mild.

As you can see, the blood present in your dog's penis is never a good sign. In the event that blood, both in combination with urine and not, please consult one of our online veterinarians urgently. After answering you will be referred to the best rated clinic in your city.