Wiktionary
a. (context simile English) Very energetic and enthusiastic, especially when sexually aroused. alt. (context simile English) Very energetic and enthusiastic, especially when sexually aroused.
Usage examples of "like a dog in heat".
She held herself up on her hands and knees while his stepfather rode her like a dog in heat.
It worked itself against her like a dog in heat, howling into her face.
I handed him his Popsicle and sat in the overstuffed armchair, not trusting myself to share the couch, half afraid I'd go after his leg like a dog in heat.
She was nuts about her& used to follow us around like a dog in heat& we couldn't get rid of the bitch!
Shut inside his own kitchen with a gibbering sub-midget hugging his leg like a dog in heat At the thought, he glanced down.
And she was on top of you like a dog in heat right from the word go, wasn't she?