Just because there are imperfections in english, doesn't mean I can't complain about imperfections in other languages...

Besides that, there's a huge difference, since plurals have clear cut rules, while object genders are only by memory with qualified guessing. That said I would welcome "2 dog", although Japanese has other problems with counters (e.g. "yonko", "yottsu", "yonki" etc), so not a very compelling argument to make...

Plurals aren't so clear cut. English isn't as bad as German for this, but there's still a bunch of different ways to write plural forms: s, es, ies, i, en, and of course some nouns don't have a plural.