My dog has had 2 serious seizures in 3 weeks

Hi, im just wanting to get other peoples opinions on whether it would be unfair to put my dog to sleep its breaking my heart so much
To start with he is a 7 year old mix breed quite a big mix breed too, he has had pretty much perfect health the past 7 years and then a few months ago he had a seizure not too serious he came round really quickly and was fine, then 3 weeks ago he had a serious seizure he was on his side legs paddling but he had no control he peed all over himself and when he came out of it he wouldnt let me in the kitchen he would growl as if he didn't know who I was and it took him about 6 hours to come out of that and then just a few days ago he had another really bad seizure he peed on himself again and had no control of his body he came out of that and it took him from 3 in the afternoon until the next morning to stop growling at just the sound of my voice and the vets think at his age it will most likely be a brain tumor and my heart hurts so much but we can't afford the mri scan as this alone can cost around £1200 and then any treatment after, would it be really horrible of me to put him to sleep before he gets any worse because id hate to leave him to suffer or risk a worse seizure and him not surviving it im just so torn as I love him so much thank you if you read this as it is long sorry for that

 

They said the medication could make them worse and more often so I wasnt to keen on this but the vet I went through was the pdsa and they dont have an mri scanner but said he would need one as this is the most likely cause for a dog over a certain age to have seizures ive looked at the prices with private vets and its expensive if he needed an operation who knows how much that would be but my friends dog last night had to go to the vets and needs a bladder operation which will cost around £3000 so the cost for treating a brain tumor would likely be alot more, i feel so horrible he doesnt deserve this hes such a good boy

 

Thank you for the advice im going to ring a different vet see what their advice would be maybe they will think it is something different who knows, its hard because I have 2 young kids and him growling after a seizure for hours is heartbreaking and the other vet said they can be aggressive and with the growling and him taking longer each time to be himself again Im scared this may happen but I will get a different opinion thank you

 

I have spoken to a different vets they said if the first vet said it would most likely be a brain tumor it most probably is, the risk of him being aggressive after a seizure with 2 young kids in the house is scary, he already growls just at the sound of my voice after hes had one and then we cant get into our kitchen for over 10 hours because we've had to leave him in there because that's where his bed is, its so hard but I think the best choice would be to let him go peacefully before he ends up seriously ill or worse

 

I'm just devastated at the thought of it but I can not see my best friend suffer with what will only get worse, ive had him 7 years hes been there every time I've cried, when my daughter needed heart surgery he protected her when she came home, all these things in life hes been there and my heart is absolutely broken