Tag Archives: shelter dogs

Cortisol in shelter dog hair shows signs of stress

Posted on April 23, 2022 | Leave a comment

In the Netherlands, thousands of dogs stay in a shelter every year. Despite the good care, a shelter can be a stressful environment for dogs. Researchers at Utrecht University investigated if the amount of the hormone cortisol in hair indicates the levels of stress that dogs experience before, during and after their stay in the shelter.

There is no difference between the cortisol levels of dogs when they enter the shelter and the control group of domestic dogs. After six weeks in the shelter, cortisol levels in the hair appear to have increased by one-third (on average from 16 pg/mg to 21.8 pg/mg). In measurements six weeks and six months after adoption, cortisol levels lowered, moving in the direction of the values at admission to the shelter. The results were published in the scientific journal Scientific Reports on 21 April 2022.

Cortisol in hair

The stress hormone cortisol accumulates in hair, in humans but also in animals. By measuring cortisol levels in hair, researchers can get an idea of the stress response and recovery over weeks or months – depending on the length of the hair examined. This technique has been used extensively in humans and other species, and some fifteen scientific studies have been carried out in dogs so far.

“In addition to the cortisol measurements in hair, we also measured cortisol values in the dogs’ urine. This gives a short-term picture while the hair measurements show the long term”, researcher Janneke van der Laan explains.

To the shelter every day

The researchers examined hair of 52 shelter dogs at four moments: just before admission, after six weeks in the shelter, six weeks after adoption and six months after adoption. They compared the cortisol values before admission with those of twenty domestic dogs, which were similar in terms of breed, age and sex.

Van der Laan: “We took daily measurements in the shelter for over a year. After adoption, the new owners – after clear instructions – cut the dogs hair and sent it to us. They were helpful and enthusiastic, and were very interested in what their dog had experienced before adoption.”

For the cortisol measurements, hair from the same location on the body was used every time. The researchers shaved the area and allowed new hair to grow during the period in which they wanted to measure the stress hormones. This is called a ‘shave-reshave method’.

More cortisol in small dogs

A surprising result is that smaller dogs generally have higher cortisol levels than larger dogs. “We have also seen this pattern in previous studies, for example in a study on the resting pattern of shelter dogs. We don’t have a clear hypothesis about why that is, but it is interesting and is an area of focus for future research.”

Well-being in shelter

All the examined shelter dogs were in the same shelter, the largest in the Netherlands. Of course there are significant differences between shelters, not only within the Netherlands but also internationally. In The Netherlands, dogs are usually kept individually, while in other countries they are often kept in groups.

“We know that a shelter is not a stress-free environment for dogs, even though staff members do their best to achieve the highest possible welfare,” Van der Laan says. “Even if you organise a shelter in the best possible way, there are still stress factors, such as crowds of other dogs and not being able to go outside as often as usual. And most important: the dog is gone from their old, familiar environment.”

The shelter in this study has a pioneering role in improving the welfare of dogs: they use glass walls instead of bars to reduce noise pollution for the dogs, for example. “The fact that we measured an increased amount of cortisol even in this shelter, suggests that this will also be the case in other shelters,” Van Der Laan said.

Source: Utrecht University

Restless nights: shelter housed dogs need days to adapt to new surroundings

Posted on August 5, 2021 | Leave a comment

Every year, thousands of dogs end up in a shelter in the Netherlands. Experts expect an increase in this number in the upcoming period, when people go back to the office after working from home during the corona crisis.

Despite the good care of staff and volunteers, the shelter can be a turbulent experience for dogs. Researchers at Utrecht University investigated if dogs can adapt to their new environment based on their nocturnal activity.

Janneke van der Laan and fellow researchers from Utrecht University’s Faculty of Veterinary Medicine compared the nocturnal activity of 29 shelter dogs and 29 pet dogs in their own homes – similar in breed, age and sex – with the help of night cameras and a small activity tracker on their collar.

They found that shelter dogs rest much less at night than pet dogs, especially during the first two nights in the shelter. This restlessness did decrease over time, but even after twelve days in the shelter, the dogs still rested less at night than the pet dogs.

“We also saw this restlessness in hormone measurements in the urine of shelter dogs” says Janneke van der Laan. Shelter dogs had higher values of the stress hormone cortisol in their urine than pet dogs, especially during the first two days but also after twelve days. It was also striking that smaller shelter dogs, for instance Shi Tzu’s and Chihuahua’s, were more restless during the first two nights than larger shelter dogs, and they also had higher cortisol values.

The researchers found big differences between individual dogs: some were already quite calm during the first night in the shelter, while others barely slept for a few nights. “It seems that dogs need at least two days, but often longer to get used to their new environment, in this case the shelter,” Van der Laan explains. “Humans usually also sleep less good during the first night in a new environment, for example at the beginning of a vacation.”

“With our follow-up research we will zoom in even further on the welfare of dogs in shelters. But our current findings already show that it is important to pay close attention to dogs that are unable to rest properly after several nights. The shelter staff may already be able to help these dogs by for example moving them to a less busy spot in the shelter.”