Hi,
Is your dog from a working strain rather than show strain?
At 5 months still be very careful on the amount of exercise 15-20 mins
outsde the garden is more than enough exercise at this stage.
I have Goldens Ive always had them on hills science till 12 months,and
in my opinion is one the best complete foods.The feeding guides is just
that a guide.However if your dog is happier are the food you've changed
to then thats probably fine.
In Goldens they grow from the feet up and the head is the last part of the body to finish,so I personally would not worry too much about his head just yet he not finished growing.
I had my Golden at the vets he took one look at his feet and said hes going to be a massive dog I said I certainly hope not, the line he comes
fom are all within the breed standard in terms of height he is 31/2 months
hes got some growing to do to fiill his frame making his feet look big.
Vets don't always know the height of different breeds and also they vary so much.
As for his weight I think others may be able to advise better.My pup
currently weighs 15.7 kg at 31/2 months Ipersonally prefer to see a pup pleasntly rounded but not fat.Again bone density varies between dogs
as does their frames.
I'm sure others will be along to advise,
Regards Briony