# Blog Post: How Much Will My Dog Weigh? Using Bayesian Modeling to Predict My Dog’s Weight
**URL:** https://discourse.pymc.io/t/blog-post-how-much-will-my-dog-weigh-using-bayesian-modeling-to-predict-my-dog-s-weight/13235
**Category:** Sharing
**Tags:** modeling
**Created:** [November 2, 2023, 5:37pm UTC](https://discourse.pymc.io/t/blog-post-how-much-will-my-dog-weigh-using-bayesian-modeling-to-predict-my-dog-s-weight/13235 "2023-11-02T17:37:30Z")
**Posts on this page:** 5
**Page:** 1
### Author:  [@hectormz](https://discourse.pymc.io/u/hectormz)
#### Post date: [November 2, 2023, 5:37pm UTC](https://discourse.pymc.io/t/blog-post-how-much-will-my-dog-weigh-using-bayesian-modeling-to-predict-my-dog-s-weight/13235/1 "2023-11-02T17:37:30Z")
Hi All,
I wrote a blog post about predicting my dog’s weight using Bayesian modeling with pymc and @twiecki suggested I share it here, too.
[Probably Credible: How Much Will My Dog Weigh? Using Bayesian Modeling to Predict My Dog’s Weight](https://www.probablycredible.com/blog/bayesian-model-dog-weight/)
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### Author:  [@ricardoV94](https://discourse.pymc.io/u/ricardoV94)
#### Post date: [November 3, 2023, 4:45am UTC](https://discourse.pymc.io/t/blog-post-how-much-will-my-dog-weigh-using-bayesian-modeling-to-predict-my-dog-s-weight/13235/2 "2023-11-03T04:45:49Z")
This was a great read. Do these models work for the lifetime of a dog or do they end up predicting ~~giraffes~~ whales?
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### Author:  [@aakhmetz](https://discourse.pymc.io/u/aakhmetz)
#### Post date: [November 3, 2023, 8:54am UTC](https://discourse.pymc.io/t/blog-post-how-much-will-my-dog-weigh-using-bayesian-modeling-to-predict-my-dog-s-weight/13235/3 "2023-11-03T08:54:35Z")
I wonder why do you think that the dog would not loose weight while becoming old?
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### Author:  [@hectormz](https://discourse.pymc.io/u/hectormz)
#### Post date: [November 3, 2023, 5:55pm UTC](https://discourse.pymc.io/t/blog-post-how-much-will-my-dog-weigh-using-bayesian-modeling-to-predict-my-dog-s-weight/13235/4 "2023-11-03T17:55:17Z")
Good points! These models will asymptotically approach Y\_M, so they shouldn’t grow to the size of a whale. I think if you have data that includes the change in weight starting to slow down, you should arrive at a reasonable maximum weight. If your data only includes growth, who knows how wrong a least squares method might be. But the Bayesian method should be grounded by the Y\_M prior.
A more useful question might be “How tall/long/wide will my dog grow to be?” For me, weight is a proxy for dog size, because it is much easier to measure. There is some final size a dog may reach, but the weight will change some as food/activity/age changes. Depending on the dog and owner, the dog might put on extra weight as they grow old!
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### Author:  [@aakhmetz](https://discourse.pymc.io/u/aakhmetz)
#### Post date: [November 6, 2023, 3:44pm UTC](https://discourse.pymc.io/t/blog-post-how-much-will-my-dog-weigh-using-bayesian-modeling-to-predict-my-dog-s-weight/13235/5 "2023-11-06T15:44:20Z")
are you talking about the BMI for dogs? 😃