Weighing Your Guinea Pig


Willow says that weighing your pigs wheekly is important! Schedule a day and time to help you remember!

Have you weighed your guinea pig?

Wheekly Weighing is an important routine to do with your guinea pig. Weighing weekly helps to determine weight loss or weight gain. Choose any day during the week and a time during that specific day to always weigh your guineas.

We decided to use Wednesdays for our #WheeklyWeighIn since it’s a “w” and easy to remember for #WednesdayWeigh/#WeighInWednesday.

Why Do It

Guinea pigs are prey animals. They hide their illnesses from others, and this can include you! Weight loss can be indicative of many different illnesses, and weighing is an easy way to catch any problem before they get too serious. Any fluctuation up OR down should have a reason behind it. Did they have surgery? Change in diet such as veggies, fruits, or pellets?

If there is a pattern of weight loss, then make sure to bring your guinea in to the vet to see what might be causing the problem. One of the most common reasons can be because of malocclusion – which is when the teeth become overgrown and they are unable to eat properly.

How Often – When to Weigh Daily


Kalsie has her #WheeklyWeigh, though she didn’t seem entirely happy about it this week!

WheeklyWeighIn is just that, once a week! However, there are times when you should weigh your guinea pig daily. If your guinea pig is ill or if directed by your veterinarian, then you should weigh your guinea daily to monitor their health.

Again, if your guinea pig is ill, weigh daily.

What Else Can You Do?

A general health check over of your guinea is highly recommended along with the wheekly weigh. This can check for other problems your guinea pig might have. This includes checking over the front teeth, ears, eyes, fur, skin, and nails. Also, gently feel your guinea from head to tail for any new and unusual lumps/bumps and to see if they react differently or in pain to your touch.

Correct Weight


“Mom, did you say I GAINED weight?!” Sorry ol’ chap…! That new year’s resolution thing is really not working for you. Maybe lay off the carrots? Though we know it won’t happen. 😋

Much like humans, guinea pigs can have variable normal weight that can vary between one pig to another. This is because different guinea pigs can have different bone structures/genetics that can affect it. However, in many veterinarian books, and according to Guinea Lynx, the ‘normal’ weight for adult guineas are as follows:

Adult Males – 900-1200 grams (1.98-2.64 lbs)

Adult Females – 700-900 grams (1.54-1.98 lbs)


Weight Fluctuation 
Some fluctuation is normal, so do not panic if the weight may be slightly higher or lower than the week before.

The rule of thumb across the guinea pig community is the following for weight fluctuation.

28.35 grams (0.063 lbs) = Okay

56.70 grams (0.126 lbs) = Monitor

85.05 grams (0.189 lbs) = Monitor Closely (we weigh daily at this point)

113.4 grams (0.252 lbs) = Bring Guinea to Vet Immediately


What Scale Type


Cannot tare? No worries! [weight of guinea pig and item on scale] – [weight of item] = [weight of guinea pig]

Kitchen scales are perfect for weighing your guinea pig. Make sure you get a scale that can go up to 4 pounds (or higher if you have a cuy).

If you have a smaller scale like we do, use a bowl or box to put your guinea in before weighing. Even using a book can help! We like to become creative. If your scale cannot tare, then make sure you record the weight of the book, box, or bowl before putting your guinea pig on it. Afterwards, then subtract the weight of your object to find the weight of your guinea.

We really like using books and kleenex boxes since they are convenient and fun colors.



How do you weigh your guinea pigs? Any tips?

Use #wheeklyweighin2017 to post it on instagram or twitter so others can see your great guineas and see how they’re doing!