It would be best to first get to know what your mom likes. That way, we atleast have one card placed straight when it comes to showing love. My point is that if you give a dog which your mom may not like so much, it may not be in the best of interests, and her opinion is most important.
WHat you will have to consider is:
1. Training/Walking/Running - which is amust have for some dogs like G.S and Labs. Could cause a strain on your mum.
2. Shedding/Maintaining (Tics, etc) - which are part of the package for some dogs like G.S, Pomnerians etc. Boxers drool all over all the time. Could cause a strain, in ters of general maintenance.
3. Mutual Affection (Friendly) - Dogs like Labs and Fox Terriers aim to please the host more often than others. These dogs are very homely and 'understand' the master/mistress to a great extent.
4. Alertness/Bravado - Again, some dogs (GS, Labs, Boxers, etc) almost 'own' complete protection of those they love.
5. Health - Some dogs are known for different types of sickness, especially given various climatic conditions. I know of a GS who dies in Udupi after spending a marvellous winter, unable to take the summer heat. A close pal of mine, in Mangalore, had to install an a/c because everyone advised him to but a Saint Bernard and he later found out that the poor thing could not take the heat!
Some questions to ask your self are:
How much space do you have?
How much exercise and care time do you have for the dog
What size is good?
Where is the dog going to be living?
How much grooming do you want to do?
Do you have the experience to deal with a more challenging dog?
If you have children how will the dog be with them?
The following is a good link to get started on which dog to get - http://www.wikihow.com/Choose-a-Dog
A good site to know about dogs in India is - http://www.dogsindia.com/
An online dog buying/selling activity happens at -
One last peice of advice - Please dont buy a dog because it looks 'sooo cuuute' - all puppies look cute. Think of what you require to do a year later :Heh heh:
and Trigger offcourse is thrilled to bits 
