Can You Get From cat To dog?

Instructions:
Star with a word like cat and changeit into another word like dog by changing exactly one letter at a time.
Each new word must be a valid English word.
You can work from either end.
You can't switch letters or add or subtract any.
You can go for cat to cot but not to act or cats or at.

Here is an example: cat, cot, cog, dog.