Very late to this question but I am almost certain of it. Firstly, it is a useful skill in nature -- if a dog or cat has a large litter, the first sign that someone is missing is a short count. I also knew a cat who was "coparented" and one of the coparents attempted to even out the number of kittens who were nursing.
Years after your question was asked, a woman started to teach a young female puppy named Bunny to use word buttons and the results are nothing short of amazing -- there are many videos on Youtube showing her doing things like announcing in the afternoon that it will be night soon or, lacking a word for "splinter" said there was a "stranger" in her paw and when the paw was inspected, indeed there was a piece of wood stuck in it.
As for numeracy, I am somewhat surprised that they have yet to give her word buttons for the number 1 through 5 -- Bunny has said so many remarkable things that I am almost certain she could answer questions like "How many?" just as some parrots can.
What her owner does that is closest to showing Bunny can count is she makes the "Roo" sound which Bunny seems to do when she is excited. Her owner can say "Roo" N number of times and Bunny will repeat "Roo" the same number of times, up to six. But it would be so easy to add buttons for the numbers -- perhaps they will do that soon or someone else will.