Experienced and professional animal trainer provide their insights in answering this question :
A. The staples should have been removed or fallen out on their own over time post-spay. However if you were able to remove the staple yourself, and there was no tissue grown over or signs of infection (heat, oozing discolored debris, pain, etc) then your bichon will likely be fine. If you are seeing signs of infection or are unable to remove the staple yourself, then bringing her back into the vet for care is best.

How to Identify Common Pet Problems ?

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If your dog`s incision has non-dissolving sutures, staples, or stent sutures, they are usually removed 10-14 days after surgery; the actual time depends on the type of surgery performed. Your veterinarian will tell you when to return to the clinic for suture or staple removal.
The most obvious clinical sign of ovarian remnant surgery is when a previously spayed dog goes into heat. This can happen at any time after spay surgery, with a delay of months to years. The signs that a dog is in heat include swelling of the vulva and blood-tinged vaginal discharge.
An infected spay incision will likely be quite red and swollen. You may also observe drainage from the area, including blood or purulent discharge. Sutures may be missing and you may even notice underlying tissue protruding from the wound.
For some dogs, this can progress to a point where they have difficulty holding their urine even when awake. It`s estimated that between 5 percent and 20 percent of spayed dogs develop USMI and urine leakage. The larger the dog, the more likely it is to develop incontinence.
Non-absorbable stitches usually stay in for 5 to 14 days, depending on where they are. Staples usually stay in for 7 to 10 days. Staples need to be taken out with a special staple remover.
Unlike stitches, surgical staples don`t dissolve as your incision or wound heals. For this reason, they require some special care and must be removed by your doctor once the incision has healed.
Most dogs and cats that are spayed early in life will not develop pyometra. However, a uterine stump pyometra may occur after incomplete ovariohysterectomy which allows a segment of the uterine body or horn to become infected.
A true stump pyometra is an uncommon problem which refers to a hormone (progesterone) mediated infection of a remnant of the uterus.
A recent spay incision should be a clean, straight wound and the edges should be sealed with glue, stitches or staples. The skin will be slightly swollen and a slight reddish-pink color around the edges. As the incision heals, you will want to check the area for redness, swelling or discharge.
The presence of bacteria and yeast on the skin is normal; however, if either appears in excess, or if the skin barrier is unhealthy, or if the dog is immunocompromised, an infection can occur. Bacterial or yeast infections of the skin can be very itchy and result in constant licking of the affected area.
The short answer is that no, your dog isn`t likely to be less hyperactive after getting spayed or neutered. It won`t change their personality much, if at all. Each dog has its own positive and negative social habits.
Urinary incontinence-dribbling urine/inability to control urination. Infections in the abdomen or the remaining small piece of the uterus. Weight gain in females. Bleeding during or after surgery either internally, from the incision or from the vulva that can result in death.
It is important to remove the stitches or staples in the recommended time frame from the doctor. Failure to do so can result in complications. When stitches are left in for too long, it can result in marks on the skin and in some cases, result in scarring.
Surgical staples usually remain in place for one to two weeks, depending on the type of surgery and the placement of the staples. In some cases, internal staples may not be removed. They are either absorbed or become permanent additions to hold internal tissue together.
Sometimes, despite our best efforts and watchful eye, dogs can remove their surgical staples. Unless your dog has done this within a few days of returning home from surgery, or you notice pus, excessive bleeding, or a large, open wound where the staple is missing, your dog should be just fine.
Unless instructed by your vet, never clean your dog`s incision site with water or ointment. Don`t use alcohol since it may delay the healing of your pup`s wounds or irritate the incision site. If your dog has an open wound, you may use warm tap water and pat it dry with a clean, dry cloth or paper towel.
Potential Side Effects of Spaying Your Dog

A small number of studies report that unspayed female dogs who are aggressive to family members may become more aggressive after they`re spayed. This could be caused by a decrease in estrogen and oxytocin, both of which may have calming, anti-anxiety effects.

The initial stage of pyometra usually comes with a slight vaginal discharge with no prominent symptoms. Pets diagnosed with pyometra later show visible signs. Dogs with pyometra also have an increased white blood cell count and globulins in the blood. Some dogs may also have painful, enlarged abdomen.
Interestingly, what happens is that once the ovaries are removed, the uterus atrophies, or shrinks away and basically dies on its own. The end result is therefore the same: no uterus = no risk of pyometra and no tumors of the uterus.
Acute redness, swelling or bruising at the incision site. Bleeding or pus from the incision site. Vomiting or diarrhea longer than 24 hours after the procedure (some immediately after can be normal as a result of anesthesia) The incision site reopens.
Because of the additive effect of years of heat cycles, middle-aged or older intact female dogs are more prone to developing pyometra. However, it can also occur in young dogs.
Signs of Wound Infection in Dogs

Common symptoms of an infected wound are evidence of swelling, pain, redness, and discharge (especially bloody or yellow discharge). Many pets will also have a fever and can have decreased appetite and lethargy. Some pets will also lick at an infected wound.

A seroma is a build-up of straw-coloured bodily fluids in an area where tissue has been removed at surgery. The fluid can make the area feel hard and this can become uncomfortable.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

Q. My female bichon was spayed 4 years ago. I just found a staple that was left. Should I be concerned
ANSWER : A. The staples should have been removed or fallen out on their own over time post-spay. However if you were able to remove the staple yourself, and there was no tissue grown over or signs of infection (heat, oozing discolored debris, pain, etc) then your bichon will likely be fine. If you are seeing signs of infection or are unable to remove the staple yourself, then bringing her back into the vet for care is best.

Read Full Q/A … : This tastes yummy!

Q. Does an indoor cat need to be vaccinated every year?
ANSWER : A. In practice, I recommend a feline combo vaccine every year, but will generally start administering every 3 years once they have had their kitten vaccines and 2 additional yearly vaccines. Rabies, is required yearly by law, and if kept up to date can be good for up to three years also. Based on the age of your cat I would give a yearly feline combo and rabies, and then boost the combo again next year.

Q. I have a 13 1/2 year old Shih Tzu. How old is he in dog years?
ANSWER : A. It’s used to be that dog years were 7 years to every 1. Now it normally around 5 years to every year as long as your dog is healthy and kept up with vaccines. So he’s about 68ish in dog years.

Read Full Q/A … : Shih Tzu Age

Q. Hi my dog breast is swollen what i do
ANSWER : A. If your pet is not spayed or was spayed after 1-2 years of age there is a chance that this swelling could be mammary cancer. Mammary cancer in pets is common and the chances of cancer are decreased an the risk of getting cancer is only 0.5% if spayed before the 1st heat cycle, 8% if spayed before the 2nd heat cycle, 26% if spayed by the 3rd heat cycle. After the 3rd heat cycle spaying a pet will not decreased chances of mammary cancer.
I would highly advise that you take your pet tot he vet to have this area examined. Typically mammary cancer lumps are firm and can be on multiple breasts.
Without seeing the lump myself, another possibility here is a lipoma (soft fatty tumor) or an abscess.

Q. I have a 3 year old female, spayed about 3 months aqo. Since the spay she has had hair loss, weight loss and on both sides there is swelling.
ANSWER : A. I would be very concerned about the weight loss and swelling. I recommend you get her assessed with a full health check and possibly bloods to investigate exactly what is going on. Some cats can have changes in hair coat related to hormone changes after being spayed but this is unlikely to be related to her other issues.

Q. My female cat is now seven years old and has not been spayed. Will she continue to go into heat? Is it too late to have her spayed?
ANSWER : A. It’s not too late to have her spayed and she might continue to go into heat for a few more years.

Read Full Q/A … : Expert Q&A – The Daily Cat

Q. I gave a spayed outdoor female cat that was literally choked by a dog. How to introduce her to indoor cat who is currently in heat?
ANSWER : A. Introduce slowly in a neutral environment such as a tub. I would recommend spaying the female in heat to reduce aggression towards other females and males. Also your cat in heat will not try to escape to mate and will discontinue meowing as much calling out for a mate.

Q. My 9 year old lab has tested positive for heart worms. A feed store owner told me I could use Noromectin (ivermectin) to get rid of them? Is it safe?
ANSWER : A. The feed store owner is taking about the “slow kill” method for adult heartworms. This method is the considered an alternate method that has the following disadvantages over the normal immiticide treatment:
1) Takes years (often-times up to 2-4 years) to completely rid heartworms vs immiticide treatment which takes at most 3 months
2) Slowly kills baby worms only in the bloodstream, does not kill adult worms in the heart. Immiticide kills the adult worms that are in the heart directly which is why it is so effective.
3) Higher risk of thromboembolism (clots in the lung artery) than Immiticide treatment.
4) Adult worms will stay in the heart for years and can impede blood flow.
So that is the gist of doing the slow kill method for baby heartworms instead of the fast kill method with Immiticide for adult heartworms. Which is why most veterinarians will recommend the fast kill method as the best choice for your pets care.