Both are stunning dogs. I would agree that there is Bullmastiff in Arthur but, just my opinion, he is not pure Bullmastiff.

Looks some mastiff but one think I know for sure is Jack is cute, cute, CUUUUTE!!!!

Yes I saw his mum she was a pure black lab, I think the mastiff had a bit of rotty in him but just looks like a pure mastiff to me! Jacks gorgeous cant figure out just yet if hes going to have his dads build or his mums? Time will tell, hes all legs at the moment he needs to grow into them!

Yeah I agree with you I was told Arthur (Jacks dad) had a bit of rotty in him and that he was only a few inches taller than his mum Ruby the labrador, so for that reason alone I don't believe Arthur is pure Mastiff he would be alot taller?

He certainly is LOL x

It dosn't matter what the breed it's how there socialized and how there owner trains them .He is a wonderful pup look forward to seeing how he gets on you are very lucky and so is he to have you

he is a cute pup !

Lovely pup x Daddy looks like a cross to me, I love Bullmastiffs they're lush I learnt to walk hanging off the family Bullmastiff but they're not particularly tall ya know about 27" to the shoulders, same as my Dobermann male.

Aww Bless Fab shots Jack's gorgeous Thanks for sharing x

Ive only had labradors and currently have a sprocker too never had a bull breed so its a learning curve, his personality is totally different to my others already but hes doing great they say a cross breed is often more intellegent than a pure breed(I can confirm this with my sprocker!) and hes certainly learning fast, he had his first day yesterday with no 'accidents' indoors so im really pleased bless him! the breeder did say that his dad was only a couple of inches taller than the mother (lab) so will see!