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I wouldn't worry too much about Tessa getting fat.... It didn't happen with mine and they were all older when they were spayed. I was worried that they would get fat but monitored there food intake . Nothing is uglier than a fat GSP! Here are a few pics of Rayne from last month. The 2 dog pic is her and her mom, Terra. Gail
In case my personal experience helps:
Gracie was spayed at about 9 months. She did have one heat cycle prior to this (about 7 months). The vet measured/weighed her at the spay appointment = 23", 43lbs. My opinion: a little underweight.
She will be a year at the end of this month and has put on about 5lbs. (looks like all muscle in the shoulders and hips to me). So, measurements this month are 23", 48lbs. I think she's at her ideal weight right now...lean and mean.
Her build looks very similar to the photo of Rayne...maybe a little less chest, little more rear. Healthy looking GSPs in my opinion.
Rayne are Terra are gorgeous by the way!