@PeachesThePig - No, this is incorrect.
A piggy should not weigh between the amounts you quote. The number on the scales is not indicative of what is a healthy body size for an individual piggy, it only tells you that they are eating enough hay to maintain their weight. The only way to know that a piggy has a healthy body size for themselves is to check their heft, not their weight.
A boar can healthily weigh 1500-1600g and still be a perfectly good heft - I have one such boar. Equally being 800g with a good heft is also perfectly healthy.
If the OPs piggy weighed more, he may well become out of proportion and unhealthy for his body type, so causing a piggy to artificially stay within such restrictive supposed weight ranges by overfeeding or underfeeding would be detrimental to long term health and lifespan.
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@MarissaLynne
The number on the scales is not a indicator of what is right for the individual piggy.
As long as your piggy does not lose weight (this means they are not eating enough hay) and is a good heft for themselves, then there is nothing to worry about.
The guide below explains further about the importance of weekly weight checks, and gauging their heft.
Weight - Monitoring and Management
Please do not overfeed him with veg. This will not increase his weight (if he is a good heft, then he doesn’t need his weight to be increased anyway and certainly not in an unhealthy way) as veg is only supplementary and makes up only 15% of the daily food intake, but instead could mean he eats less hay which will be detrimental to his long term health. Overdoing veg can also cause digestive upsets so should not be done.
If he is actually losing weight (the guide explains what we is meant by weight loss and differentiates between normal daily fluctuation, slower but longer term weight loss and emergency weight loss), then you must immediately step in and syringe feed him to stabilise him and see a vet.
For the daily diet, they need
Unlimited hay (around 80% of the daily food intake)
One cup of veg (around 15% of the daily food intake)
And one tablespoon of pellets per pig per day. (1/8 of a cup is 1.66 tablespoons and 1/4 of a cup converts to 3 tablespoons so is too much per piggy - you should give just a little over 1/8 of a cup between them both). (Around 5% of the daily food intake)
Long Term Balanced General And Special Needs Guinea Pig Diets