What counts for dogs (Canis lupus familiaris) in a quantity discrimination task?

@article{Petrazzini2016WhatCF,
  title={What counts for dogs (Canis lupus familiaris) in a quantity discrimination task?},
  author={Maria Elena Miletto Petrazzini and Clive D.L. Wynne},
  journal={Behavioural Processes},
  year={2016},
  volume={122},
  pages={90-97}
}
Food quantity discrimination in puppies (Canis lupus familiaris)
TLDR
The findings suggest that the capacity to discriminate between quantities is already present at an early age, but that it is limited to very easy discriminations.
Wolves and Dogs May Rely on Non-numerical Cues in Quantity Discrimination Tasks When Given the Choice
TLDR
This study used a touch screen paradigm to investigate the quantity discrimination abilities of two closely related group-living species, wolves and dogs, using a simultaneous visual presentation paradigm and found dogs’ performance greatly exceeded that which they had shown in other numerical competence paradigms.
Spontaneous quantity discrimination in a family-living lizard
TLDR
Evidence is uncovered that species might possess specific cognitive abilities potentially adapted to their niche with respect to quantity information (discrete and/or continuous) and the processing system used when judging quantities.
Do Domestic Dogs (Canis lupus familiaris) Perceive Numerosity Illusions?
TLDR
The lack of dogs’ susceptibility to the Solitaire illusion suggests that numerical estimation of dogs is not influenced by the spatial arrangement of the items to be enumerated, which suggests that the perceptual mechanisms might be different in humans and dogs.
Dogs (canis familiaris) underestimate the quantity of connected items: first demonstration of susceptibility to the connectedness illusion in non-human animals
TLDR
The similarity in dogs’ and humans’ susceptibility to the connectedness, but not to other numerical illusions, suggests that different mechanisms are involved in the estimation of quantity of stimuli with different characteristics.
Do domestic dogs (Canis lupus familiaris) perceive the Delboeuf illusion?
TLDR
The fact that dogs do not seem to be susceptible to the Delboeuf illusion suggests a potential discontinuity in the perceptual biases affecting size judgments between primates and dogs.
Experimental setting affects the performance of guppies in a numerical discrimination task
TLDR
It is suggested that guppies might be prepared to accurately estimate patch quality during foraging but not to learn an abstract stimulus–reward association, and that the different results with the two experimental settings might be due to constraints on learning.
Any reward will do: Effects of a reverse-reward contingency on size preference with pet dogs (Canis lupus familiaris)
TLDR
The results were consistent with the previous RRC literature: All dogs developed and maintained a preference for the larger stimulus option across conditions, and the use of symbolic representations did not ameliorate performance on the RRC task.
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References

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Quantity-based judgments in the domestic dog (Canis lupus familiaris)
TLDR
The results suggest that, like apes tested on similar tasks, some dogs can form internal representations and make mental comparisons of quantity.
Is your choice my choice? The owners’ effect on pet dogs’ (Canis lupus familiaris) performance in a food choice task
TLDR
Evidence is provided that dogs can be influenced by their owners even when their indications are clearly in contrast with direct perceptual information, thus leading dogs to ultimately make counterproductive choices.
Do Dogs (Canis lupus familiaris) Make Counterproductive Choices Because They Are Sensitive to Human Ostensive Cues?
TLDR
Results show that dogs' evaluation errors are indeed caused by a social bias, but, somewhat contrary to previous studies, they highlight the potent effect of stimulus enhancement (handling the target) in influencing the dogs' response.
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TLDR
Findings support the analog magnitude model of quantity representation as an explanation for capuchin monkeys’ quantification of sequentially presented food items.
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TLDR
Results showed that cats can be trained to discriminate between the two quantities and suggested that cats do not spontaneously use numerical information, but rather seem to make use of visual cues that co-vary with numerosity in order to solve the task.
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TLDR
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