As contradictory as it may seem, sometimes adding supplements to a dog's (esp puppy) food intake can cause huge issues. Bodies are meant to run and develop efficiently with a certain balance of intake, and your particular puppy has been taking in an enormous amount of minerals, and the Ca+ /P balance is crucial to not stop a cascade of other nutrient effect/affect on a developing body. It's not a lay person's bailiwick usually, and most people trust manufacturers and also most have the 'more is better' mindset... and that 'more is better' is what you are seeing play out w the street dogs, who do not have the opportunities for 'more' that Superman has. More is sometimes more detrimental than nearly none, depending on what the 'more' is.
for instance:
Calcium | 2.5% min |
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Calcium | 3.5% max |
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Phosphorus | 2.5% min |
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When a label doesn't say a certain mg of Ca+ but instead a percentage of weight, it really tells us nothing.
Because a puppy's body can't adequately regulate how much dietary calcium they absorb from the intestines, they sometimes use too much if diet includes it, which can cause skeletal malformations.
I feel that if you've sent the vet I suggested the labelling on the products/food and the photos she asked for, you will be able to get a clearer understanding of what might be going on, from the perspective of a person who is learned in nutrition and development. Time difference though will likely play into that so it won't be an instant answer, I think we're 9.5 hours apart on time, and she'll be looking at your dog (and prob getting others' opinions) while at work today.
Your flooring would play a much bigger role in an old dog whose joints are naturally growing less able. Old dogs, yes- putting down runners is a smart move. Young dogs, assuming he's not got slipper feet (hair under the feet) his pads should be able to keep him from slip-sliding, or should have, before his pasterns fell.
I just don't get the mindset of the vet- to not do imaging to rule out a serious condition seems odd to me. I am guessing given your expenditures on food/supps, you can afford a full workup. It just seems too casual and careless on the vet to assume anything without proof but maybe veterinary care isn't same there as here- here, any of my vets when presented w a problem such as this, would lay out a plan for definitive diagnostics and let me make the choice on whether I could afford various things.
Genetics might be playing a role here, too, but almost certainly all the minerals your puppy is taking in have a bigger role imo. I admire that you are working to get an answer that feels 'right' to you.
Please let us know once you have your consult-