They do not have periods, exactly; rather, they go into heat. In humans, menstruation is believed to be a "womb cleaning" that occurs at the opposite end of the roughly-monthly menstrual cycle from the fertile times. In dogs and cats, the equivalent clean-out seems to happen immediately before and as the animal becomes fertile. A little blood spotting is quite common, especially in dogs, as a dog "comes into heat" or enters her fertile period. Cats seem to be more fastidious and leave little sign of spotting.
Only primates have menstrual cycles - it is one of the defining features of the classification.
dogs and cats and dogs and cats and dogs and cats and ........
Cats do but dogs don't
Dogs hate cats because cats are stupid.
They don't.. Dogs act like dogs and cats act like cats.
cats are stupid and lazy, dogs are awesome and cute+energetic (dogs also do much more than cats.)
never there not the same as humans!
they are more of cats then dogs but they are not cats
dogs and cats and dogs and cats and dogs and cats and ........
dogs and cats and dogs and cats and dogs and cats and ........
The dogs win in the movie cats and dogs.
Dogs:)
Because dogs are to good for cats.
cats are smarter then dogs .
Cats do but dogs don't
The answer depends on whether you want the ratio ofdomesticated cats and dogs to other domesticated pets,domesticated cats and dogs to non-domesticated cats and dogs,domesticated cats to domesticated dogs,some other ratio that I have not considered!
It means simple sentences like I like cats. I hate dogs. Let's play. Come to my house. They usually end in periods.
Cats and dogs, cats and dogs 2: the revenge of kitty galore, cats,