hi all, i need some advice!

i have two springer spaniels that keep fighting each other all the time.

my bitch is 3 years old, and my dog is 5 months old.

the dog has a habit of wanting to play all the time (as pups do) but my bitch is a little grumpy and has some mental problems and is not a very playful dog.

when the dog wants to play he tends to jump on her back and nip her fae and ears, and she then retaliates by snapping and snarling, this does not deture the dog he just carries on jumping on her, then fights begin.

this only started a few weeks ago, we have had the dog (sam) for 3 months and this has never happend before.

please help, any advice welcome.