I'm doing the nerd thing again and showing off my latest guinea pig weight chart. Last year's tracked a fairly stable Pinniped and a growing Cannoli. What a difference to this year's chart: X marks when Pinni and Noli traded weights, just before the new year. Not really what I forecasted last year.
I'm used to Pinni's smaller size now, so it's rather shocking to see the weight loss in the chart. Her weight is very erratic, although I can see there's been some improvement since May. I'd be happier if that line smoothed out a bit. Cannoli has obviously hit her adult weight, with a slight increase in the last few months due to extra pellets and summer blobbing. She needs a few more laps around the living room, and to leave those extra pellets for Pinni to eat.
The chart may be a nerd thing, but it clearly illustrates the importance of weighing guinea pigs on a regular basis. I feel like I've been dealing with the smaller-sized Pinni forever, but it's only been six months that she's been this thin. It's easy to forget a guinea pig's size and feel from a year ago. The chart also tells me that if Cannoli gradually lost 80g, it may not be a sign of illness, but that she's returning to her baseline weight. Knowing a guinea pig's normal weight fluctuation is useful in tracking their overall health.
There's more information about weighing your guinea pig at Guinea Lynx : Weigh Weekly!