Can guinea pigs eat tomatoes?

Can guinea pigs eat tomatoes?

My answer is: yes, but just the ripe fruit and I only feed him about 1 a week, the breeder said you can go up to 1 at a push but I stick with half once a week. Cherry tomatoes are normally the ones I feed, and the really ripe ones. It is important to avoid green tomatoes, I also remove all seeds because my guinea pig does not like them much.

Key facts

• Safe in Moderation Only: Tomatoes are for the occasional treat only, not a daily necessity. 
• Limit servings to (I do half) but 1 cherry tomato/1-inch slice of a larger tomato 1-2 times per week. 
• Toxic: Stems, Leaves, any sort of green parts: Nightshade tomatoes are in the nightshade family. The leaves, stems, vines and unripe green fruit contain tomatine and solanine which is poisonous glycoalkaloids that cause severe poisoning, lethargy or digestive shutdown. 
• Feed only: 100% fully ripe red flesh. 
• Beware of Acidity: Cheilitis: Tomatoes contain a high level of acid & oxalates. Overfeeding acidic foods can cause cheilitis, which is red, scabby sores around the corners of the guinea pig's mouth, and stomach upset or diarrhea.
• Nutritional Benefits: I have a table below but they provide Vitamin C (important in preventing scurvy as guinea pigs can not make their own Vitamin C) along with potassium and water. 
• Preparation Steps: Sponge wash to remove pesticides then cut up small.

Are tomatoes dangerous for guinea pigs?

No, as long as you don't feed more than 1 or 2 at a push a week. 

Jimmy is my Abyssinian, I know I normally write about other things but... I am a bit of a crazy guinea pig lover, my vet and breeder was very particular about what he can and can't eat. And tomatoes were the thing she spent the most time on, more than most veg.  

I will be honest with you, when I feed Jimmy tomatoes I have to be more careful (due to the seeds but also the skin) and I only give him half a tomato (a very red one) once a week if that. The reason is due to being careful of chelitis. The breeder said that too much tomato will cause chelitis due to how sugary the tomato is.

I sometimes peel back the skin but you don’t have to, it is because I am freaked out at any choking. You also can't feed these everyday, my breeder said at most two once a week. Jimmy likes a small range of the special tomatoes with the heads on, you know the ripe expensive ones. He likes tomatoes as a treat second to bell peppers.

What is the nutritional value of tomatoes for your guinea pig?

*Values are approximate and based on 100g of raw tomato. Feed ripe tomato flesh only in small amounts. Never feed the leaves, stems or unripe green tomatoes, as these contain tomatine, which can be harmful to guinea pigs.

Why you should be careful of tomatoes around guinea pigs?

Tomatoes belong to the nightshade family along with potatoes and eggplant, and in the plant itself is found tomatine (unripe or green tomatoes and the leaves/stems contain so much more of this, and a related compound called solanine). That stuff is poisonous to guinea pigs. The ripe red fruit is safe (that part) but the leaves and stems, vines and that green tomato better stay out of the bowl.

Honestly, the first time I bought tomatoes off the vine I kind of forgot about it until I was pulling the stem off one for myself and thought, wait, would that have been a problem if I had just thrown the whole thing in there? Now I strip all the green off before it gets near him.

What is good about tomatoes for your pig?

Once you get past the ripe fruit though, tomatoes are no bad treat. There's a good amount of vitamin C in them, which is important because guinea pigs can not make their own and they need it from food to avoid scurvy, but they do have some. They also have relatively low sugar levels compared with a lot of fruit - they don't send Jimmy into sugar-treat territory like a grape would.

Does guinea pigs like them?

Oh, yes. This is no celery situation (which he is not keen on). The second I chop up some tomato he comes out of the cage and kind of runs about excitedly. And he goes through it fast - no half-chewed leftovers around after. So if celery is the "I'll have a bite" food, tomato is the "get in my mouth right away" food.

How much tomatoes weekly for guinea pigs?

This is the bit I watch out for as I said above, too much tomato can make things worse than they are with the ripe fruit alone - overdoing it can cause mouth sores or diarrhea. So I just have it as a tiny piece, cherry-tomato about half once a week rather than anymore. In my house it's a treat really.

Tomatoes are one of Jimmy's favourite things, I give them to him, I just strip them off first and I cut it up quite fine, but he does like it. If I let him he would eat an entire tomato in one sitting. But he will not be let.

What my breeder and Vet said?

When the breeder and vet went through tomatoes with me, seeds were never flagged as a problem but she did say try to avoid them, it was all about the green parts to be careful and how much you feed them. Just be wary of: the leaves and stems, vines and unripe fruit, not so much the flesh or the seeds. The seeds and skin of a ripe tomato is considered normal fruit for guinea pigs, so you don't need to deseed a slice before you give it to Jimmy the way you might for an apple with its pips. I hope that helps you.

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Reviewed by Karl Martin, 5th August 2026 qualified vet