自己写了一个英语句子，请高手帮忙看有什么语法错误没。或者有什么更好的表达方式。谢谢了~~

Question

I have a dog named niuniu when it come to our home has been one year and a half, but it has an bad temper when others’ dogs smell it ass and touch it food.

Answer 1

为你解答。
I have a dog named niuniu.
解释：名字要大写。最好分成两句。
改：I have a dog. Its name is Niuniu.

when it come to our home has been one year and a half,
解释：它来到家里，是过去时。一年半了，是完成时。
改：It has been one year and a half since it came to our home.

but it has an bad temper
解释：这个可以单独成为一句。an用得不当。
改：But it has a bad temper.

when others’ dogs smell it ass and touch it food.

解释：others'改成other，其它的狗。还要补上一句。还有it要改为its，它的。
When other dogs smell its ass，or touch its food，it will be angry.
意思：当其他狗闻它的pp时，或碰它的食物时，它会生气的。

Answer 2

I have a dog named Niuniu, it has been one and a half year since it came to our house. It has a bad temper, especially when other dogs smell its butt or touch its food.
ps. 不要随便用ass

Answer 3

I have a dog named niuniu .it has been one year and a half (when最好改成since） it （came） to our home . （but去掉没有转折的意思啊）It (has an bad temper改为will be angry) when (other) dogs smell (its) ass and touch (its) food.