Studies have shown that petting or rubbing your dog’s ears releases endorphins. Your dog’s ears have many nerve endings that react when rubbed.
Dog urine can range from slightly acidic to slightly alkaline (between pH 5.5-pH 8). If your artificial grass does not have proper backing underneath it, this can result in the urine getting trapped and absorbed, leading to unpleasant smells being released.
Small female dogs may go into heat three times a year compared to larger breeds that may have a season once a year. Every dog is different, so it’s hard to say exactly how often it happens.