Dog and cat owners are familiar with the age-old debate: which of the two species is smarter? However, answering this question is impossible, especially due to the difficulty of a sound comparison. 

The degree to which our two most popular pets are similar to each other has long been a source of a scientific debate. Many comparative studies have already been conducted on these species, with varying degrees of success. For example, it is unclear whether they are able to recognize human communicational signals, such as pointing, to the same extent. 

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Source: biologia.elte.hu/en