Crooked as a dog's hind leg simile
Very dishonest and deceptive
Don't play cards with Tom. He's as crooked as a dog's hind leg.
I advised Mary shouldn't put her trust in Tony. He's as crooked as a dog's hind leg.
To be dishonest or deceptive and no one can believe
If you fall for someone's trick the first time then they are at fault.
Are you going to mess with me again? Fool me once, shame on you; fool me twice, shame on me.