"Mohammed hated dogs."
Not worthy to breathe good air. Tells you all about the man you need to know.
That's because:
Bukhari:V1B4N174 "During the lifetime of Allah's Apostle dogs used to urinate and pass through the mosque. Nevertheless they never used to sprinkle water on it."
No, they just prostrated on the ground and kissed it regardless if the dogs pee'd there. BUT..
Bukhari:V1B4N137"Allah's Apostle said, ‘The prayer of a person who does Hadath (passes urine, stool or wind) is not accepted till he performs ablution.'"
Apparently,Dog pee wasn't the only obstacle to avoid when praying in the mosk..