Oh Goody - a poo question! The stuff of gods
There appear to be three issues; one is that a dog is poo'ing during a time of day that is not usual, two is that the dog is poo'ing "out of place", and three, the color and consistency of the poo.
I'd be tempted to deal with the first two issues first. Excuse me for not keeping up with you and your dogs, but are these guys puppies? And that's why you use a pad? Adult dogs ought to be able to hold it. Since you said this is a new occurrence, are they getting a higher volume of treats in the evening without a chance to go outside?
I feed Schoen in the morning, we go for our walk and he poos twice during our walk. I do not treat in the evening... usually... I try not to
Second, if you "allow" them to pee on the mats, it seems to me they can't distinguish between being "allowed" to pee versus poo. I can't see dogs making that distinction.
Now, the color and consistency. In my experience white is from bones and the dryness is also from eating bones because bones are dry. As a kid I type-cast small dogs, particularly poodles with white poos.
I found an article on comparing fecal characteristics for different sizes and breeds of dogs on dry and canned dog food, but there wasn't any mention of white poos or dry poos. Only that different dogs have different poos for the same diet.
Here's the summary of the article, it may give you some insights into your dog's poo
Quote:
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The digestive capacity of dogs varying in body size was tested. Digestive experiments were conducted with 10 different canine breeds (n = 66) with body weights ranging from 4.2 to 52.5 kg with 4–9 individuals. The animals were fed a canned or a dry commercial diet with a constant dry matter intake of 13 g/kg BW/day, except in Irish wolfhounds, which ingested only 10 g dry matter with the canned diet. Faecal dry matter was around 14% (absolutely) higher for the dry diet compared to the canned food, with a tendency in the larger breeds towards higher faecal water contents, less favourable faecal quality and increased numbers of defaecations. The Irish wolfhounds, the largest breed tested, had faeces with considerably lower water contents compared to Labrador retrievers, indicating that body weight is not the only factor to be considered. There were only small differences in the apparent digestibility of crude nutrients amongst the breeds. Sodium and potassium absorption was higher when the dry diet was fed compared to the canned food. In conclusion, breed and individual factors have to be taken into account when performing tests with dog food. Test panels for evaluating commercial diets should include breeds of larger body size and higher sensitivity to dietary disorders.
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