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 pigs. Weighing them weekly helps determine weight loss or weight gain. Choose a specific day during each week and a specific time during that 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 regular weighing is an easy way to catch problems before they get too serious. Any fluctuation up OR down should have a reason behind it. Did they have surgery? A 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 is malocclusion – which is when the teeth become overgrown and the guineas 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 its health.

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

What Else Can You Do?

A general health check of your guinea is highly recommended along with the wheekly weigh. This can reveal any 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’ normal weight can vary from one pig to another. This is because different guinea pigs have different bone structures/genetics that can affect their weight. However, in many veterinarian books, and according to Guinea Lynx, the ‘normal’ weight for adult guineas is 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 your guinea’s weight is 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 To Use


Can’t 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 be creative. If your scale can’t tare, then make sure you record the weight of the book, box, or bowl before putting your guinea pig on it. Afterwards, 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 come in 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!