"Frequently" is another way to say often in all types of English. You can use "its" because in English, the gender of animals isn't as important as that of humans. I hope that this helps! :)
どちらも「うちの猫はよく自分のフンを踏む。」という意味です。
1) My cat is always stepping in his/ her own poop.
2) My cat often steps on his/her poop.
「踏む」は step in や step on と言います。
「糞」は poop または dung と言う人もいます。
ご参考になれば幸いです！
"My cat steps in its poop!"
"My cat always has poop on its paws!"
"My cat steps in its own faeces!"
Both of the above sentences can explain that your cat is always stepping in its own poop/faeces/excrement.
"faeces" and "excrement" are different words that you can use for poop
"My cat steps in its poop!"（私の猫は自分のふんを踏みます）
"My cat always has poop on its paws!"（私の猫はいつも手にふんがついています）
"My cat steps in its own faeces!"（私の猫は自分のふんを踏みます）
上記どの文を使っても、猫がいつも自分の "poop/faeces/excrement"（ふん）を踏んでしまうことを説明できます。
"faeces" と "excrement" は "poop"（ふん）の別の言い方です。
My cat has a bad habit of stepping on its own poop.
If you would like to explain that your cat often steps on its own poop, you can explain it by saying:
"My cat has a bad habit of stepping on its own poop."
The word "habit" refers to the fact that it happens very often.
「うちの猫はよく自分の出したふんを踏んでしまう」は次のように言えます。
"My cat has a bad habit of stepping on its own poop."
（うちの猫はよく自分の出したふんを踏んでしまう）
"habit" はよく起こる事を表します。
When talking about poop we can also use the word 'faeces' meaning the same thing and sound slightly more polite
If your cat is doing something alot of the time then you can say 'always' or 'often'
to step or stepping means to put your feet/paws into something
When talking about your cat, you can talk about the cat in the past, present or future. If the cat stepped in the poop in the past, you would say "my cat has stepped in her own poop".
If the action is being performed in the present, then you can say "my cat is stepping in her own poop".
If the action is happening in the future, you can say "my cat will always step in her own poop"
これは過去形か現在形かあるいは未来形で表すことができます。
猫が過去にふんを踏んだなら、"my cat has stepped in her own poop"（私の猫は自分のふんを踏んだことがある）と言えます。
それが今現在行われていることなら、"my cat is stepping in her own poop"（猫がふんを踏んでいる）と言えます。
それがこれから先に起こることなら、"my cat will always step in her own poop"（私の猫は自分のふんを踏んでしまうだろう）と言えます。
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